X-Git-Url: http://nitlanguage.org

diff --git a/src/parser/parser_nodes.nit b/src/parser/parser_nodes.nit
index 6f60b77..5aba49d 100644
--- a/src/parser/parser_nodes.nit
+++ b/src/parser/parser_nodes.nit
@@ -20,11 +20,9 @@ import location
 
 # Root of the AST class-hierarchy
 abstract class ANode
-	var _location: nullable Location = null
-
 	# Location is set during AST building. Once built, location cannon be null.
 	# However, manual instantiated nodes may need more care.
-	fun location: Location do return _location.as(not null)
+	var location: Location is writable, noinit
 
 	# The location of the important part of the node (identifier or whatever)
 	fun hot_location: Location do return location
@@ -32,20 +30,69 @@ abstract class ANode
 	# Display a message for the colored location of the node
 	fun debug(message: String)
 	do
-		print "{hot_location} {self.class_name}: {message}\n{hot_location.colored_line("0;32")}"
+		sys.stderr.write "{hot_location} {self.class_name}: {message}\n{hot_location.colored_line("0;32")}\n"
 	end
 
 	# Parent of the node in the AST
 	var parent: nullable ANode = null
 
-	# Protect form invalid instantiation of nodes
-	private init do end
+	# The topmost ancestor of the element
+	# This just apply `parent` until the first one
+	fun root: ANode
+	do
+		var res = self
+		loop
+			var p = res.parent
+			if p == null then return res
+			res = p
+		end
+	end
+
+	# The most specific common parent between `self` and `other`
+	# Return null if the two node are unrelated (distinct root)
+	fun common_parent(other: ANode): nullable ANode
+	do
+		# First, get the same depth
+		var s: nullable ANode = self
+		var o: nullable ANode = other
+		var d = s.depth - o.depth
+		while d > 0 do
+			s = s.parent
+			d -= 1
+		end
+		while d < 0 do
+			o = o.parent
+			d += 1
+		end
+		assert o.depth == s.depth
+		# Second, go up until same in found
+		while s != o do
+			s = s.parent
+			o = o.parent
+		end
+		return s
+	end
+
+	# Number of nodes between `self` and the `root` of the AST
+	# ENSURE `self == self.root implies result == 0 `
+	# ENSURE `self != self.root implies result == self.parent.depth + 1`
+	fun depth: Int
+	do
+		var n = self
+		var res = 0
+		loop
+			var p = n.parent
+			if p == null then return res
+			n = p
+			res += 1
+		end
+	end
 
 	# Replace a child with an other node in the AST
 	private fun replace_child(old_child: ANode, new_child: nullable ANode) is abstract
 
 	# Detach a node from its parent
-	# Aborts if the node is not detashable. use `replace_with` instead
+	# Aborts if the node is not detachable. use `replace_with` instead
 	# REQUIRE: parent != null
 	# REQUIRE: is_detachable
 	# ENDURE: parent == null
@@ -73,7 +120,7 @@ abstract class ANode
 end
 
 # A sequence of nodes
-# There is a specifc class (instead of a using Array) to track the parent/child relation when nodes are added or removed
+# It is a specific class (instead of using a Array) to track the parent/child relation when nodes are added or removed
 class ANodes[E: ANode]
 	super Sequence[E]
 	private var parent: ANode
@@ -133,7 +180,7 @@ class ANodes[E: ANode]
 		e.parent = null
 	end
 
-	# Used in parent contructor to fill elements
+	# Used in parent constructor to fill elements
 	private fun unsafe_add_all(nodes: Collection[Object])
 	do
 		var parent = self.parent
@@ -175,15 +222,26 @@ abstract class Token
 
 	# The raw content on the token
 	fun text: String is abstract
+
+	# The raw content on the token
 	fun text=(text: String) is abstract
 
 	# The previous token in the Lexer.
-	# May have disapeared in the AST
-	var prev_token: nullable Token
+	# May have disappeared in the AST
+	var prev_token: nullable Token = null
 
 	# The next token in the Lexer.
-	# May have disapeared in the AST
-	var next_token: nullable Token
+	# May have disappeared in the AST
+	var next_token: nullable Token = null
+
+	# The verbatim blank text between `prev_token` and `self`
+	fun blank_before: String
+	do
+		if prev_token == null then return ""
+		var from = prev_token.location.pend+1
+		var to = location.pstart
+		return location.file.string.substring(from,to-from)
+	end
 
 	redef fun to_s: String do
 		return "'{text}'"
@@ -193,21 +251,29 @@ abstract class Token
 	redef fun replace_child(old_child: ANode, new_child: nullable ANode) do end
 end
 
+redef class SourceFile
+	# The first token parser by the lexer
+	# May have disappeared in the final AST
+	var first_token: nullable Token = null
+
+	# The first token parser by the lexer
+	# May have disappeared in the final AST
+	var last_token: nullable Token = null
+end
+
 # Ancestor of all productions
 # A production is a node without text but that usually has children.
 abstract class Prod
 	super ANode
 
-	fun location=(l: Location) do _location = l
-
 	# All the annotations attached directly to the node
-	readable writable var _n_annotations: nullable AAnnotations = null
+	var n_annotations: nullable AAnnotations = null is writable
 
 	redef fun replace_with(n: ANode)
 	do
 		super
 		assert n isa Prod
-		if n._location == null then n._location = _location
+		if not isset n._location and isset _location then n._location = _location
 	end
 end
 
@@ -231,7 +297,7 @@ abstract class Visitor
 	end
 
 	# The current visited node
-	readable writable var _current_node: nullable ANode = null
+	var current_node: nullable ANode = null is writable
 end
 
 # Token of end of line (basically `\n`)
@@ -257,183 +323,288 @@ abstract class TokenKeyword
 		return "keyword '{text}'"
 	end
 end
+
+# The deprecated keyword `package`.
 class TKwpackage
 	super TokenKeyword
 end
+
+# The keyword `module`
 class TKwmodule
 	super TokenKeyword
 end
+
+# The keyword `import`
 class TKwimport
 	super TokenKeyword
 end
+
+# The keyword `class`
 class TKwclass
 	super TokenKeyword
 end
+
+# The keyword `abstract`
 class TKwabstract
 	super TokenKeyword
 end
+
+# The keyword `interface`
 class TKwinterface
 	super TokenKeyword
 end
+
+# The keywords `enum` ane `universal`
 class TKwenum
 	super TokenKeyword
 end
+
+# The keyword `end`
 class TKwend
 	super TokenKeyword
 end
+
+# The keyword `fun`
 class TKwmeth
 	super TokenKeyword
 end
+
+# The keyword `type`
 class TKwtype
 	super TokenKeyword
 end
+
+# The keyword `init`
 class TKwinit
 	super TokenKeyword
 end
+
+# The keyword `redef`
 class TKwredef
 	super TokenKeyword
 end
+
+# The keyword `is`
 class TKwis
 	super TokenKeyword
 end
+
+# The keyword `do`
 class TKwdo
 	super TokenKeyword
 end
-class TKwreadable
-	super TokenKeyword
-end
-class TKwwritable
-	super TokenKeyword
-end
+
+# The keyword `var`
 class TKwvar
 	super TokenKeyword
 end
-class TKwintern
-	super TokenKeyword
-end
+
+# The keyword `extern`
 class TKwextern
 	super TokenKeyword
 end
+
+# The keyword `public`
 class TKwpublic
 	super TokenKeyword
 end
+
+# The keyword `protected`
 class TKwprotected
 	super TokenKeyword
 end
+
+# The keyword `private`
 class TKwprivate
 	super TokenKeyword
 end
+
+# The keyword `intrude`
 class TKwintrude
 	super TokenKeyword
 end
+
+# The keyword `if`
 class TKwif
 	super TokenKeyword
 end
+
+# The keyword `then`
 class TKwthen
 	super TokenKeyword
 end
+
+# The keyword `else`
 class TKwelse
 	super TokenKeyword
 end
+
+# The keyword `while`
 class TKwwhile
 	super TokenKeyword
 end
+
+# The keyword `loop`
 class TKwloop
 	super TokenKeyword
 end
+
+# The keyword `for`
 class TKwfor
 	super TokenKeyword
 end
+
+# The keyword `in`
 class TKwin
 	super TokenKeyword
 end
+
+# The keyword `and`
 class TKwand
 	super TokenKeyword
 end
+
+# The keyword `or`
 class TKwor
 	super TokenKeyword
 end
+
+# The keyword `implies`
 class TKwimplies
 	super TokenKeyword
 end
+
+# The keyword `not`
 class TKwnot
 	super TokenKeyword
 end
+
+# The keyword `return`
 class TKwreturn
 	super TokenKeyword
 end
+
+# The keyword `continue`
 class TKwcontinue
 	super TokenKeyword
 end
+
+# The keyword `break`
 class TKwbreak
 	super TokenKeyword
 end
+
+# The keyword `abort`
 class TKwabort
 	super TokenKeyword
 end
+
+# The keyword `assert`
 class TKwassert
 	super TokenKeyword
 end
+
+# The keyword `new`
 class TKwnew
 	super TokenKeyword
 end
+
+# The keyword `isa`
 class TKwisa
 	super TokenKeyword
 end
+
+# The keyword `once`
 class TKwonce
 	super TokenKeyword
 end
+
+# The keyword `super`
 class TKwsuper
 	super TokenKeyword
 end
+
+# The keyword `self`
 class TKwself
 	super TokenKeyword
 end
+
+# The keyword `true`
 class TKwtrue
 	super TokenKeyword
 end
+
+# The keyword `false`
 class TKwfalse
 	super TokenKeyword
 end
+
+# The keyword `null`
 class TKwnull
 	super TokenKeyword
 end
+
+# The keyword `as`
 class TKwas
 	super TokenKeyword
 end
+
+# The keyword `nullable`
 class TKwnullable
 	super TokenKeyword
 end
+
+# The keyword `isset`
 class TKwisset
 	super TokenKeyword
 end
+
+# The keyword `label`
 class TKwlabel
 	super TokenKeyword
 end
+
+# The special keyword `__DEBUG__`
 class TKwdebug
 	super Token
 end
+
+# The symbol `(`
 class TOpar
 	super Token
 end
+
+# The symbol `)`
 class TCpar
 	super Token
 end
+
+# The symbol `[`
 class TObra
 	super Token
 end
+
+# The symbol `]`
 class TCbra
 	super Token
 end
+
+# The symbol `,`
 class TComma
 	super Token
 end
+
+# The symbol `:`
 class TColumn
 	super Token
 end
+
+# The symbol `::`
 class TQuad
 	super Token
 end
+
+# The symbol `=`
 class TAssign
 	super Token
 end
@@ -446,66 +617,113 @@ abstract class TokenOperator
 		return "operator '{text}'"
 	end
 end
+
+# The operator `+=`
 class TPluseq
 	super TokenOperator
 end
+
+# The operator `-=`
 class TMinuseq
 	super TokenOperator
 end
+
+# The symbol `...`
 class TDotdotdot
-	super TokenOperator
+	super Token
 end
+
+# The symbol `..`
 class TDotdot
-	super TokenOperator
+	super Token
 end
+
+# The symbol `.`
 class TDot
-	super TokenOperator
+	super Token
 end
+
+# The operator `+`
 class TPlus
 	super TokenOperator
 end
+
+# The operator `-`
 class TMinus
 	super TokenOperator
 end
+
+# The operator `*`
 class TStar
 	super TokenOperator
 end
+
+# The operator `**`
+class TStarstar
+	super TokenOperator
+end
+
+# The operator `/`
 class TSlash
 	super TokenOperator
 end
+
+# The operator `+%
 class TPercent
 	super TokenOperator
 end
+
+# The operator `==`
 class TEq
 	super TokenOperator
 end
+
+# The operator `!=`
 class TNe
 	super TokenOperator
 end
+
+# The operator `<`
 class TLt
 	super TokenOperator
 end
+
+# The operator `<=`
 class TLe
 	super TokenOperator
 end
+
+# The operator `<<`
 class TLl
 	super TokenOperator
 end
+
+# The operator `>`
 class TGt
 	super TokenOperator
 end
+
+# The operator `>=`
 class TGe
 	super TokenOperator
 end
+
+# The operator `>>`
 class TGg
 	super TokenOperator
 end
+
+# The operator `<=>`
 class TStarship
 	super TokenOperator
 end
+
+# The operator `!`
 class TBang
 	super TokenOperator
 end
+
+# The symbol `@`
 class TAt
 	super Token
 end
@@ -545,27 +763,43 @@ abstract class TokenLiteral
 		do return "literal value '{text}'"
 	end
 end
+
+# A literal decimal integer
 class TNumber
 	super TokenLiteral
 end
+
+# A literal hexadecimal integer
 class THexNumber
 	super TokenLiteral
 end
+
+# A literal floating point number
 class TFloat
 	super TokenLiteral
 end
+
+# A literal character
 class TChar
 	super TokenLiteral
 end
+
+# A literal string
 class TString
 	super TokenLiteral
 end
+
+# The starting part of a super string (between `"` and `{`)
 class TStartString
 	super TokenLiteral
 end
+
+# The middle part of a super string (between `}` and `{`)
 class TMidString
 	super TokenLiteral
 end
+
+# The final part of a super string (between `}` and `"`)
 class TEndString
 	super TokenLiteral
 end
@@ -588,6 +822,7 @@ class TBadChar
 	end
 end
 
+# A extern code block
 class TExternCodeSegment
 	super Token
 end
@@ -605,9 +840,11 @@ end
 class AError
 	super EOF
 end
+# A lexical error (unexpected character)
 class ALexerError
 	super AError
 end
+# A syntactic error (unexpected token)
 class AParserError
 	super AError
 end
@@ -616,18 +853,20 @@ end
 class AModule
 	super Prod
 
-	readable writable var _n_moduledecl: nullable AModuledecl = null
-	readable var _n_imports: ANodes[AImport] = new ANodes[AImport](self)
-	readable var _n_extern_code_blocks: ANodes[AExternCodeBlock] = new ANodes[AExternCodeBlock](self)
-	readable var _n_classdefs: ANodes[AClassdef] = new ANodes[AClassdef](self)
+	var n_moduledecl: nullable AModuledecl = null is writable
+	var n_imports = new ANodes[AImport](self)
+	var n_extern_code_blocks = new ANodes[AExternCodeBlock](self)
+	var n_classdefs = new ANodes[AClassdef](self)
 end
 
 # The declaration of the module with the documentation, name, and annotations
 class AModuledecl
 	super Prod
-	readable writable var _n_doc: nullable ADoc = null
-	readable writable var _n_kwmodule: TKwmodule
-	readable writable var _n_name: AModuleName
+	var n_doc: nullable ADoc = null is writable
+	var n_kwredef: nullable TKwredef = null is writable
+	var n_visibility: AVisibility is writable, noinit
+	var n_kwmodule: TKwmodule is writable, noinit
+	var n_name: AModuleName is writable, noinit
 end
 
 # A import clause of a module
@@ -638,17 +877,17 @@ end
 # A standard import clause. eg `import x`
 class AStdImport
 	super AImport
-	readable writable var _n_visibility: AVisibility
-	readable writable var _n_kwimport: TKwimport
-	readable writable var _n_name: AModuleName
+	var n_visibility: AVisibility is writable, noinit
+	var n_kwimport: TKwimport is writable, noinit
+	var n_name: AModuleName is writable, noinit
 end
 
 # The special import clause of the kernel module. eg `import end`
 class ANoImport
 	super AImport
-	readable writable var _n_visibility: AVisibility
-	readable writable var _n_kwimport: TKwimport
-	readable writable var _n_kwend: TKwend
+	var n_visibility: AVisibility is writable, noinit
+	var n_kwimport: TKwimport is writable, noinit
+	var n_kwend: TKwend is writable, noinit
 end
 
 # A visibility modifier
@@ -660,41 +899,48 @@ end
 abstract class AVisibility
 	super Prod
 end
+
+# An implicit or explicit public visibility modifier
 class APublicVisibility
 	super AVisibility
+	var n_kwpublic: nullable TKwpublic is writable
 end
+# An explicit private visibility modifier
 class APrivateVisibility
 	super AVisibility
-	readable writable var _n_kwprivate: TKwprivate
+	var n_kwprivate: TKwprivate is writable, noinit
 end
+# An explicit protected visibility modifier
 class AProtectedVisibility
 	super AVisibility
-	readable writable var _n_kwprotected: TKwprotected
+	var n_kwprotected: TKwprotected is writable, noinit
 end
+# An explicit intrude visibility modifier
 class AIntrudeVisibility
 	super AVisibility
-	readable writable var _n_kwintrude: TKwintrude
+	var n_kwintrude: TKwintrude is writable, noinit
 end
 
 # A class definition
 # While most definition are `AStdClassdef`
 # There is tow special case of class definition
-abstract class AClassdef super Prod
-	readable var _n_propdefs: ANodes[APropdef] = new ANodes[APropdef](self)
+abstract class AClassdef
+	super Prod
+	var n_propdefs = new ANodes[APropdef](self)
 end
 
 # A standard class definition with a name, superclasses and properties
 class AStdClassdef
 	super AClassdef
-	readable writable var _n_doc: nullable ADoc = null
-	readable writable var _n_kwredef: nullable TKwredef = null
-	readable writable var _n_visibility: AVisibility
-	readable writable var _n_classkind: AClasskind
-	readable writable var _n_id: nullable TClassid = null
-	readable var _n_formaldefs: ANodes[AFormaldef] = new ANodes[AFormaldef](self)
-	readable writable var _n_extern_code_block: nullable AExternCodeBlock = null
-	readable var _n_superclasses: ANodes[ASuperclass] = new ANodes[ASuperclass](self)
-	readable writable var _n_kwend: TKwend
+	var n_doc: nullable ADoc = null is writable
+	var n_kwredef: nullable TKwredef = null is writable
+	var n_visibility: AVisibility is writable, noinit
+	var n_classkind: AClasskind is writable, noinit
+	var n_id: nullable TClassid = null is writable
+	var n_formaldefs = new ANodes[AFormaldef](self)
+	var n_extern_code_block: nullable AExternCodeBlock = null is writable
+	var n_superclasses = new ANodes[ASuperclass](self)
+	var n_kwend: TKwend is writable, noinit
 	redef fun hot_location do return n_id.location
 end
 
@@ -712,233 +958,191 @@ end
 abstract class AClasskind
 	super Prod
 end
+
+# A default, or concrete class modifier (just `class`)
 class AConcreteClasskind
 	super AClasskind
-	readable writable var _n_kwclass: TKwclass
+	var n_kwclass: TKwclass is writable, noinit
 end
+
+# An abstract class modifier (`abstract class`)
 class AAbstractClasskind
 	super AClasskind
-	readable writable var _n_kwabstract: TKwabstract
-	readable writable var _n_kwclass: TKwclass
+	var n_kwabstract: TKwabstract is writable, noinit
+	var n_kwclass: TKwclass is writable, noinit
 end
+
+# An interface class modifier (`interface`)
 class AInterfaceClasskind
 	super AClasskind
-	readable writable var _n_kwinterface: TKwinterface
+	var n_kwinterface: TKwinterface is writable, noinit
 end
+
+# An enum/universal class modifier (`enum class`)
 class AEnumClasskind
 	super AClasskind
-	readable writable var _n_kwenum: TKwenum
+	var n_kwenum: TKwenum is writable, noinit
 end
+
+# An extern class modifier (`extern class`)
 class AExternClasskind
 	super AClasskind
-	readable writable var _n_kwextern: TKwextern
-	readable writable var _n_kwclass: nullable TKwclass = null
+	var n_kwextern: TKwextern is writable, noinit
+	var n_kwclass: nullable TKwclass = null is writable
 end
 
 # The definition of a formal generic parameter type. eg `X: Y`
 class AFormaldef
 	super Prod
-	readable writable var _n_id: TClassid
+	var n_id: TClassid is writable, noinit
 	# The bound of the parameter type
-	readable writable var _n_type: nullable AType = null
+	var n_type: nullable AType = null is writable
 end
 
 # A super-class. eg `super X`
 class ASuperclass
 	super Prod
-	readable writable var _n_kwsuper: TKwsuper
-	readable writable var _n_type: AType
+	var n_kwsuper: TKwsuper is writable, noinit
+	var n_type: AType is writable, noinit
 end
 
 # The definition of a property
 abstract class APropdef
 	super Prod
-	readable writable var _n_doc: nullable ADoc = null
+	var n_doc: nullable ADoc = null is writable
+	var n_kwredef: nullable TKwredef = null is writable
+	var n_visibility: nullable AVisibility = null is writable
 end
 
 # A definition of an attribute
 # For historical reason, old-syle and new-style attributes use the same `ANode` sub-class
 class AAttrPropdef
 	super APropdef
-	readable writable var _n_kwredef: nullable TKwredef = null
-	readable writable var _n_visibility: AVisibility
-	readable writable var _n_kwvar: TKwvar
-
-	# The identifier for an old-style attribute (null if new-style)
-	readable writable var _n_id: nullable TAttrid
+	var n_kwvar: TKwvar is writable, noinit
 
 	# The identifier for a new-style attribute (null if old-style)
-	readable writable var _n_id2: nullable TId
+	var n_id2: TId is writable, noinit
 
-	readable writable var _n_type: nullable AType = null
-	readable writable var _n_readable: nullable AAble = null
-	readable writable var _n_writable: nullable AAble = null
+	var n_type: nullable AType = null is writable
 
 	# The initial value, if any
-	readable writable var _n_expr: nullable AExpr = null
+	var n_expr: nullable AExpr = null is writable
 	redef fun hot_location
 	do
-		if n_id != null then return n_id.location else return n_id2.location
+		return n_id2.location
 	end
 end
 
 # A definition of all kind of method (including constructors)
-abstract class AMethPropdef
+class AMethPropdef
 	super APropdef
-	readable writable var _n_kwredef: nullable TKwredef = null
-	readable writable var _n_visibility: nullable AVisibility
-	readable writable var _n_methid: nullable AMethid = null
-	readable writable var _n_signature: nullable ASignature
+	var n_kwmeth: nullable TKwmeth = null is writable
+	var n_kwinit: nullable TKwinit = null is writable
+	var n_kwnew: nullable TKwnew = null is writable
+	var n_methid: nullable AMethid = null is writable
+	var n_signature: nullable ASignature = null is writable
+	var n_block: nullable AExpr = null is writable
+	var n_extern_calls: nullable AExternCalls = null is writable
+	var n_extern_code_block: nullable AExternCodeBlock = null is writable
 	redef fun hot_location
 	do
 		if n_methid != null then
 			return n_methid.location
+		else if n_kwinit != null then
+			return n_kwinit.location
+		else if n_kwnew != null then
+			return n_kwnew.location
 		else
 			return location
 		end
 	end
 end
 
-# A method marked abstract
-# *deferred* is a old synonynmous of *abstract* that comes from PRM, that comes from Eiffel.
-class ADeferredMethPropdef
-	super AMethPropdef
-	readable writable var _n_kwmeth: TKwmeth
-end
-
-# A method marked intern
-class AInternMethPropdef
-	super AMethPropdef
-	readable writable var _n_kwmeth: TKwmeth
-end
-
-# A method of a constructor marked extern
-abstract class AExternPropdef
-	super AMethPropdef
-	readable writable var _n_extern: nullable TString = null
-	readable writable var _n_extern_calls: nullable AExternCalls = null
-	readable writable var _n_extern_code_block: nullable AExternCodeBlock = null
-end
-
-# A method marked extern
-class AExternMethPropdef
-	super AExternPropdef
-	readable writable var _n_kwmeth: TKwmeth
-end
-
-# A method with a body
-class AConcreteMethPropdef
-	super AMethPropdef
-	readable writable var _n_kwmeth: nullable TKwmeth
-	readable writable var _n_block: nullable AExpr = null
-end
-
-# A constructor
-abstract class AInitPropdef
-	super AMethPropdef
-end
-
-# A constructor with a body
-class AConcreteInitPropdef
-	super AConcreteMethPropdef
-	super AInitPropdef
-	readable writable var _n_kwinit: TKwinit
-	redef fun hot_location do return n_kwinit.location
-end
-
-# A constructor marked extern (defined with the `new` keyword)
-class AExternInitPropdef
-	super AExternPropdef
-	super AInitPropdef
-	readable writable var _n_kwnew: TKwnew
-end
-
 # The implicit main method
 class AMainMethPropdef
-	super AConcreteMethPropdef
+	super AMethPropdef
 end
 
 # Declaration of callbacks for extern methods
 class AExternCalls
 	super Prod
-	readable writable var _n_kwimport: TKwimport
-	readable var _n_extern_calls: ANodes[AExternCall] = new ANodes[AExternCall](self)
+	var n_kwimport: TKwimport is writable, noinit
+	var n_extern_calls: ANodes[AExternCall] = new ANodes[AExternCall](self)
 end
+
+# A single callback declaration
 abstract class AExternCall
 	super Prod
 end
+
+# A single callback declaration on a method
 abstract class APropExternCall
 	super AExternCall
 end
+
+# A single callback declaration on a method on the current receiver
 class ALocalPropExternCall
 	super APropExternCall
-	readable writable var _n_methid: AMethid
+	var n_methid: AMethid is writable, noinit
 end
+
+# A single callback declaration on a method on an explicit receiver type.
 class AFullPropExternCall
 	super APropExternCall
-	readable writable var _n_type: AType
-	readable writable var _n_dot: nullable TDot = null
-	readable writable var _n_methid: AMethid
+	var n_type: AType is writable, noinit
+	var n_dot: nullable TDot = null is writable
+	var n_methid: AMethid is writable, noinit
 end
+
+# A single callback declaration on a method on a constructor
 class AInitPropExternCall
 	super APropExternCall
-	readable writable var _n_type: AType
+	var n_type: AType is writable, noinit
 end
+
+# A single callback declaration on a `super` call
 class ASuperExternCall
 	super AExternCall
-	readable writable var _n_kwsuper: TKwsuper
+	var n_kwsuper: TKwsuper is writable, noinit
 end
+
+# A single callback declaration on a cast
 abstract class ACastExternCall
 	super AExternCall
 end
+
+# A single callback declaration on a cast to a given type
 class ACastAsExternCall
 	super ACastExternCall
-	readable writable var _n_from_type: AType
-	readable writable var _n_dot: nullable TDot = null
-	readable writable var _n_kwas: TKwas
-	readable writable var _n_to_type: AType
+	var n_from_type: AType is writable, noinit
+	var n_dot: nullable TDot = null is writable
+	var n_kwas: TKwas is writable, noinit
+	var n_to_type: AType is writable, noinit
 end
+
+# A single callback declaration on a cast to a nullable type
 class AAsNullableExternCall
 	super ACastExternCall
-	readable writable var _n_type: AType
-	readable writable var _n_kwas: TKwas
-	readable writable var _n_kwnullable: TKwnullable
+	var n_type: AType is writable, noinit
+	var n_kwas: TKwas is writable, noinit
+	var n_kwnullable: TKwnullable is writable, noinit
 end
+
+# A single callback declaration on a cast to a non-nullable type
 class AAsNotNullableExternCall
 	super ACastExternCall
-	readable writable var _n_type: AType
-	readable writable var _n_kwas: TKwas
-	readable writable var _n_kwnot: TKwnot
-	readable writable var _n_kwnullable: TKwnullable
+	var n_type: AType is writable, noinit
+	var n_kwas: TKwas is writable, noinit
+	var n_kwnot: TKwnot is writable, noinit
+	var n_kwnullable: TKwnullable is writable, noinit
 end
 
 # A definition of a virtual type
 class ATypePropdef
 	super APropdef
-	readable writable var _n_kwredef: nullable TKwredef = null
-	readable writable var _n_visibility: AVisibility
-	readable writable var _n_kwtype: TKwtype
-	readable writable var _n_id: TClassid
-	readable writable var _n_type: AType
-end
-
-# A `writable` or `readable` modifier
-abstract class AAble
-	super Prod
-	readable writable var _n_visibility: nullable AVisibility = null
-	readable writable var _n_kwredef: nullable TKwredef = null
-end
-
-# A `readable` modifier
-class AReadAble
-	super AAble
-	readable writable var _n_kwreadable: TKwreadable
-end
-
-# A `writable` modifier
-class AWriteAble
-	super AAble
-	readable writable var _n_kwwritable: TKwwritable
+	var n_kwtype: TKwtype is writable, noinit
+	var n_id: TClassid is writable, noinit
+	var n_type: AType is writable, noinit
 end
 
 # The identifier of a method in a method declaration.
@@ -946,117 +1150,159 @@ end
 abstract class AMethid
 	super Prod
 end
+
+# A method name with a simple identifier
 class AIdMethid
 	super AMethid
-	readable writable var _n_id: TId
+	var n_id: TId is writable, noinit
 end
+
+# A method name `+`
 class APlusMethid
 	super AMethid
-	readable writable var _n_plus: TPlus
+	var n_plus: TPlus is writable, noinit
 end
+
+# A method name `-`
 class AMinusMethid
 	super AMethid
-	readable writable var _n_minus: TMinus
+	var n_minus: TMinus is writable, noinit
 end
+
+# A method name `*`
 class AStarMethid
 	super AMethid
-	readable writable var _n_star: TStar
+	var n_star: TStar is writable, noinit
 end
+
+# A method name `**`
+class AStarstarMethid
+	super AMethid
+	var n_starstar: TStarstar is writable, noinit
+end
+
+# A method name `/`
 class ASlashMethid
 	super AMethid
-	readable writable var _n_slash: TSlash
+	var n_slash: TSlash is writable, noinit
 end
+
+# A method name `%`
 class APercentMethid
 	super AMethid
-	readable writable var _n_percent: TPercent
+	var n_percent: TPercent is writable, noinit
 end
+
+# A method name `==`
 class AEqMethid
 	super AMethid
-	readable writable var _n_eq: TEq
+	var n_eq: TEq is writable, noinit
 end
+
+# A method name `!=`
 class ANeMethid
 	super AMethid
-	readable writable var _n_ne: TNe
+	var n_ne: TNe is writable, noinit
 end
+
+# A method name `<=`
 class ALeMethid
 	super AMethid
-	readable writable var _n_le: TLe
+	var n_le: TLe is writable, noinit
 end
+
+# A method name `>=`
 class AGeMethid
 	super AMethid
-	readable writable var _n_ge: TGe
+	var n_ge: TGe is writable, noinit
 end
+
+# A method name `<`
 class ALtMethid
 	super AMethid
-	readable writable var _n_lt: TLt
+	var n_lt: TLt is writable, noinit
 end
+
+# A method name `>`
 class AGtMethid
 	super AMethid
-	readable writable var _n_gt: TGt
+	var n_gt: TGt is writable, noinit
 end
+
+# A method name `<<`
 class ALlMethid
 	super AMethid
-	readable writable var _n_ll: TLl
+	var n_ll: TLl is writable, noinit
 end
+
+# A method name `>>`
 class AGgMethid
 	super AMethid
-	readable writable var _n_gg: TGg
+	var n_gg: TGg is writable, noinit
 end
+
+# A method name `[]`
 class ABraMethid
 	super AMethid
-	readable writable var _n_obra: TObra
-	readable writable var _n_cbra: TCbra
+	var n_obra: TObra is writable, noinit
+	var n_cbra: TCbra is writable, noinit
 end
+
+# A method name `<=>`
 class AStarshipMethid
 	super AMethid
-	readable writable var _n_starship: TStarship
+	var n_starship: TStarship is writable, noinit
 end
+
+# A setter method name with a simple identifier (with a `=`)
 class AAssignMethid
 	super AMethid
-	readable writable var _n_id: TId
-	readable writable var _n_assign: TAssign
+	var n_id: TId is writable, noinit
+	var n_assign: TAssign is writable, noinit
 end
+
+# A method name `[]=`
 class ABraassignMethid
 	super AMethid
-	readable writable var _n_obra: TObra
-	readable writable var _n_cbra: TCbra
-	readable writable var _n_assign: TAssign
+	var n_obra: TObra is writable, noinit
+	var n_cbra: TCbra is writable, noinit
+	var n_assign: TAssign is writable, noinit
 end
 
 # A signature in a method definition. eg `(x,y:X,z:Z):T`
 class ASignature
 	super Prod
-	readable writable var _n_opar: nullable TOpar = null
-	readable var _n_params: ANodes[AParam] = new ANodes[AParam](self)
-	readable writable var _n_cpar: nullable TCpar = null
-	readable writable var _n_type: nullable AType = null
+	var n_opar: nullable TOpar = null is writable
+	var n_params = new ANodes[AParam](self)
+	var n_cpar: nullable TCpar = null is writable
+	var n_type: nullable AType = null is writable
 end
 
 # A parameter definition in a signature. eg `x:X`
 class AParam
 	super Prod
-	readable writable var _n_id: TId
-	readable writable var _n_type: nullable AType = null
-	readable writable var _n_dotdotdot: nullable TDotdotdot = null
+	var n_id: TId is writable, noinit
+	var n_type: nullable AType = null is writable
+	var n_dotdotdot: nullable TDotdotdot = null is writable
 end
 
 # A static type. eg `nullable X[Y]`
 class AType
 	super Prod
-	readable writable var _n_kwnullable: nullable TKwnullable = null
+	var n_kwnullable: nullable TKwnullable = null is writable
 
 	# The name of the class or of the formal type
-	readable writable var _n_id: TClassid
+	var n_id: TClassid is writable, noinit
 
 	# Type arguments for a generic type
-	readable var _n_types: ANodes[AType] = new ANodes[AType](self)
+	var n_types = new ANodes[AType](self)
 end
 
 # A label at the end of a block or in a break/continue statement. eg `label x`
 class ALabel
 	super Prod
-	readable writable var _n_kwlabel: TKwlabel
-	readable writable var _n_id: TId
+	var n_kwlabel: TKwlabel is writable, noinit
+	var n_id: nullable TId is writable
 end
 
 # Expression and statements
@@ -1065,153 +1311,153 @@ abstract class AExpr
 	super Prod
 end
 
-# A sequence of AExpr (usually statements)
-# The last AExpr gives the value of the whole block
+# A sequence of `AExpr` (usually statements)
+# The last `AExpr` gives the value of the whole block
 class ABlockExpr
 	super AExpr
-	readable var _n_expr: ANodes[AExpr] = new ANodes[AExpr](self)
-	readable writable var _n_kwend: nullable TKwend = null
+	var n_expr = new ANodes[AExpr](self)
+	var n_kwend: nullable TKwend = null is writable
 end
 
 # A declaration of a local variable. eg `var x: X = y`
 class AVardeclExpr
 	super AExpr
-	readable writable var _n_kwvar: TKwvar
-	readable writable var _n_id: TId
-	readable writable var _n_type: nullable AType = null
-	readable writable var _n_assign: nullable TAssign = null
+	var n_kwvar: TKwvar is writable, noinit
+	var n_id: TId is writable, noinit
+	var n_type: nullable AType = null is writable
+	var n_assign: nullable TAssign = null is writable
 
 	# The initial value, if any
-	readable writable var _n_expr: nullable AExpr = null
+	var n_expr: nullable AExpr = null is writable
 end
 
 # A `return` statement. eg `return x`
 class AReturnExpr
 	super AExpr
-	readable writable var _n_kwreturn: nullable TKwreturn = null
-	readable writable var _n_expr: nullable AExpr = null
+	var n_kwreturn: nullable TKwreturn = null is writable
+	var n_expr: nullable AExpr = null is writable
 end
 
 # Something that has a label.
 abstract class ALabelable
 	super Prod
-	readable writable var _n_label: nullable ALabel = null
+	var n_label: nullable ALabel = null is writable
 end
 
 # A `break` statement.
 class ABreakExpr
 	super AExpr
 	super ALabelable
-	readable writable var _n_kwbreak: TKwbreak
-	readable writable var _n_expr: nullable AExpr = null
+	var n_kwbreak: TKwbreak is writable, noinit
+	var n_expr: nullable AExpr = null is writable
 end
 
 # An `abort` statement
 class AAbortExpr
 	super AExpr
-	readable writable var _n_kwabort: TKwabort
+	var n_kwabort: TKwabort is writable, noinit
 end
 
 # A `continue` statement
 class AContinueExpr
 	super AExpr
 	super ALabelable
-	readable writable var _n_kwcontinue: nullable TKwcontinue = null
-	readable writable var _n_expr: nullable AExpr = null
+	var n_kwcontinue: nullable TKwcontinue = null is writable
+	var n_expr: nullable AExpr = null is writable
 end
 
 # A `do` statement
 class ADoExpr
 	super AExpr
 	super ALabelable
-	readable writable var _n_kwdo: TKwdo
-	readable writable var _n_block: nullable AExpr = null
+	var n_kwdo: TKwdo is writable, noinit
+	var n_block: nullable AExpr = null is writable
 end
 
 # A `if` statement
 class AIfExpr
 	super AExpr
-	readable writable var _n_kwif: TKwif
-	readable writable var _n_expr: AExpr
-	readable writable var _n_then: nullable AExpr = null
-	readable writable var _n_else: nullable AExpr = null
+	var n_kwif: TKwif is writable, noinit
+	var n_expr: AExpr is writable, noinit
+	var n_then: nullable AExpr = null is writable
+	var n_else: nullable AExpr = null is writable
 end
 
 # A `if` expression
 class AIfexprExpr
 	super AExpr
-	readable writable var _n_kwif: TKwif
-	readable writable var _n_expr: AExpr
-	readable writable var _n_kwthen: TKwthen
-	readable writable var _n_then: AExpr
-	readable writable var _n_kwelse: TKwelse
-	readable writable var _n_else: AExpr
+	var n_kwif: TKwif is writable, noinit
+	var n_expr: AExpr is writable, noinit
+	var n_kwthen: TKwthen is writable, noinit
+	var n_then: AExpr is writable, noinit
+	var n_kwelse: TKwelse is writable, noinit
+	var n_else: AExpr is writable, noinit
 end
 
 # A `while` statement
 class AWhileExpr
 	super AExpr
 	super ALabelable
-	readable writable var _n_kwwhile:  TKwwhile
-	readable writable var _n_expr: AExpr
-	readable writable var _n_kwdo: TKwdo
-	readable writable var _n_block: nullable AExpr = null
+	var n_kwwhile:  TKwwhile is writable, noinit
+	var n_expr: AExpr is writable, noinit
+	var n_kwdo: TKwdo is writable, noinit
+	var n_block: nullable AExpr = null is writable
 end
 
 # A `loop` statement
 class ALoopExpr
 	super AExpr
 	super ALabelable
-	readable writable var _n_kwloop: TKwloop
-	readable writable var _n_block: nullable AExpr = null
+	var n_kwloop: TKwloop is writable, noinit
+	var n_block: nullable AExpr = null is writable
 end
 
 # A `for` statement
 class AForExpr
 	super AExpr
 	super ALabelable
-	readable writable var _n_kwfor: TKwfor
-	readable var _n_ids: ANodes[TId] = new ANodes[TId](self)
-	readable writable var _n_expr: AExpr
-	readable writable var _n_kwdo: TKwdo
-	readable writable var _n_block: nullable AExpr = null
+	var n_kwfor: TKwfor is writable, noinit
+	var n_ids = new ANodes[TId](self)
+	var n_expr: AExpr is writable, noinit
+	var n_kwdo: TKwdo is writable, noinit
+	var n_block: nullable AExpr = null is writable
 end
 
 # An `assert` statement
 class AAssertExpr
 	super AExpr
-	readable writable var _n_kwassert: TKwassert
-	readable writable var _n_id: nullable TId = null
-	readable writable var _n_expr: AExpr
-	readable writable var _n_else: nullable AExpr = null
+	var n_kwassert: TKwassert is writable, noinit
+	var n_id: nullable TId = null is writable
+	var n_expr: AExpr is writable, noinit
+	var n_else: nullable AExpr = null is writable
 end
 
 # Whatever is a simple assignment. eg `= something`
 abstract class AAssignFormExpr
 	super AExpr
-	readable writable var _n_assign: TAssign
-	readable writable var _n_value: AExpr
+	var n_assign: TAssign is writable, noinit
+	var n_value: AExpr is writable, noinit
 end
 
 # Whatever is a combined assignment. eg `+= something`
 abstract class AReassignFormExpr
 	super AExpr
-	readable writable var _n_assign_op: AAssignOp
-	readable writable var _n_value: AExpr
+	var n_assign_op: AAssignOp is writable, noinit
+	var n_value: AExpr is writable, noinit
 end
 
 # A `once` expression. eg `once x`
 class AOnceExpr
 	super AProxyExpr
-	readable writable var _n_kwonce: TKwonce
+	var n_kwonce: TKwonce is writable, noinit
 end
 
 # A polymorphic invocation of a method
-# The form of the invocation (name, arguments, etc) are specific
+# The form of the invocation (name, arguments, etc.) are specific
 abstract class ASendExpr
 	super AExpr
 	# The receiver of the method invocation
-	readable writable var _n_expr: AExpr
+	var n_expr: AExpr is writable, noinit
 end
 
 # A binary operation on a method
@@ -1219,7 +1465,7 @@ abstract class ABinopExpr
 	super ASendExpr
 	# The second operand of the operation
 	# Note: the receiver (`n_expr`) is the first operand
-	readable writable var _n_expr2: AExpr
+	var n_expr2: AExpr is writable, noinit
 end
 
 # Something that is boolean expression
@@ -1230,36 +1476,36 @@ end
 # A `or` expression 
 class AOrExpr
 	super ABoolExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_expr2: AExpr
+	var n_expr: AExpr is writable, noinit
+	var n_expr2: AExpr is writable, noinit
 end
 
 # A `and` expression
 class AAndExpr
 	super ABoolExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_expr2: AExpr
+	var n_expr: AExpr is writable, noinit
+	var n_expr2: AExpr is writable, noinit
 end
 
 # A `or else` expression
 class AOrElseExpr
 	super ABoolExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_expr2: AExpr
+	var n_expr: AExpr is writable, noinit
+	var n_expr2: AExpr is writable, noinit
 end
 
 # A `implies` expression
 class AImpliesExpr
 	super ABoolExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_expr2: AExpr
+	var n_expr: AExpr is writable, noinit
+	var n_expr2: AExpr is writable, noinit
 end
 
 # A `not` expression
 class ANotExpr
 	super ABoolExpr
-	readable writable var _n_kwnot: TKwnot
-	readable writable var _n_expr: AExpr
+	var n_kwnot: TKwnot is writable, noinit
+	var n_expr: AExpr is writable, noinit
 end
 
 # A `==` expression
@@ -1305,8 +1551,8 @@ end
 # A type-ckeck expression. eg `x isa T`
 class AIsaExpr
 	super ABoolExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_type: AType
+	var n_expr: AExpr is writable, noinit
+	var n_type: AType is writable, noinit
 end
 
 # A `+` expression
@@ -1329,6 +1575,11 @@ class AStarExpr
 	super ABinopExpr
 end
 
+# A `**` expression
+class AStarstarExpr
+	super ABinopExpr
+end
+
 # A `/` expression
 class ASlashExpr
 	super ABinopExpr
@@ -1342,18 +1593,18 @@ end
 # A unary minus expression. eg `-x`
 class AUminusExpr
 	super ASendExpr
-	readable writable var _n_minus: TMinus
+	var n_minus: TMinus is writable, noinit
 end
 
 # An explicit instantiation. eg `new T`
 class ANewExpr
 	super AExpr
-	readable writable var _n_kwnew: TKwnew
-	readable writable var _n_type: AType
+	var n_kwnew: TKwnew is writable, noinit
+	var n_type: AType is writable, noinit
 
 	# The name of the named-constructor, if any
-	readable writable var _n_id: nullable TId = null
-	readable writable var _n_args: AExprs
+	var n_id: nullable TId = null is writable
+	var n_args: AExprs is writable, noinit
 end
 
 # Whatever is a old-style attribute access
@@ -1361,10 +1612,11 @@ abstract class AAttrFormExpr
 	super AExpr
 
 	# The receiver of the attribute
-	readable writable var _n_expr: AExpr
+	var n_expr: AExpr is writable, noinit
 
 	# The name of the attribute
-	readable writable var _n_id: TAttrid
+	var n_id: TAttrid is writable, noinit
+
 end
 
 # The read of an attribute. eg `x._a`
@@ -1383,10 +1635,10 @@ abstract class ACallFormExpr
 	super ASendExpr
 
 	# The name of the method
-	readable writable var _n_id: TId
+	var n_id: TId is writable, noinit
 
 	# The arguments of the call
-	readable writable var _n_args: AExprs
+	var n_args: AExprs is writable, noinit
 end
 
 # A complex setter call (standard or brackets)
@@ -1417,7 +1669,7 @@ class ACallAssignExpr
 end
 
 # A complex setter call with a standard method-name and any number of arguments. eg `x.m(y)+=z`. OR just a simple complex assignment.
-# Note: because the parser cannot distinguish a variable write with a compex setter call with an implicit receiver and no arguments, it always returns a `ACallReassignExpr`.
+# Note: because the parser cannot distinguish a variable write with a complex setter call with an implicit receiver and no arguments, it always returns a `ACallReassignExpr`.
 # Semantic analysis have to transform them to instance of `AVarReassignExpr`.
 class ACallReassignExpr
 	super ACallFormExpr
@@ -1427,23 +1679,23 @@ end
 # A call to `super`. OR a call of a super-constructor
 class ASuperExpr
 	super AExpr
-	readable writable var _n_qualified: nullable AQualified = null
-	readable writable var _n_kwsuper: TKwsuper
-	readable writable var _n_args: AExprs
+	var n_qualified: nullable AQualified = null is writable
+	var n_kwsuper: TKwsuper is writable, noinit
+	var n_args: AExprs is writable, noinit
 end
 
 # A call to the `init` constructor.
-# Note: because `init` is a keyword and not a `TId`, the explicit call to init cannot be a ACallFormExpr.
+# Note: because `init` is a keyword and not a `TId`, the explicit call to init cannot be a `ACallFormExpr`.
 class AInitExpr
 	super ASendExpr
-	readable writable var _n_kwinit: TKwinit
-	readable writable var _n_args: AExprs
+	var n_kwinit: TKwinit is writable, noinit
+	var n_args: AExprs is writable, noinit
 end
 
 # Whatever looks-like a call of the brackets `[]` operator.
 abstract class ABraFormExpr
 	super ASendExpr
-	readable writable var _n_args: AExprs
+	var n_args: AExprs is writable, noinit
 end
 
 # A call of the brackets operator. eg `x[y,z]`
@@ -1460,7 +1712,7 @@ end
 # Whatever is an access to a local variable
 abstract class AVarFormExpr
 	super AExpr
-	readable writable var _n_id: TId
+	var n_id: TId is writable, noinit
 end
 
 # A complex setter call of the bracket operator. eg `x[y,z]+=t`
@@ -1475,7 +1727,7 @@ class AVarExpr
 	super AVarFormExpr
 end
 
-# A local variable simple assigment access
+# A local variable simple assignment access
 # The parser cannot instantiate them, see `ACallAssignExpr`.
 class AVarAssignExpr
 	super AVarFormExpr
@@ -1492,34 +1744,37 @@ end
 # A literal range, open or closed
 abstract class ARangeExpr
 	super AExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_expr2: AExpr
+	var n_expr: AExpr is writable, noinit
+	var n_expr2: AExpr is writable, noinit
 end
 
 # A closed literal range. eg `[x..y]`
 class ACrangeExpr
 	super ARangeExpr
-	readable writable var _n_obra: TObra
-	readable writable var _n_cbra: TCbra
+	var n_obra: TObra is writable, noinit
+	var n_cbra: TCbra is writable, noinit
 end
 
 # An open literal range. eg `[x..y[`
 class AOrangeExpr
 	super ARangeExpr
-	readable writable var _n_obra: TObra
-	readable writable var _n_cbra: TObra
+	var n_obra: TObra is writable, noinit
+	var n_cbra: TObra is writable, noinit
 end
 
 # A literal array. eg. `[x,y,z]`
 class AArrayExpr
 	super AExpr
-	readable writable var _n_exprs: AExprs
+	var n_obra: TObra is writable, noinit
+	var n_exprs: AExprs is writable, noinit
+	var n_type: nullable AType = null is writable
+	var n_cbra: TCbra is writable, noinit
 end
 
 # A read of `self` 
 class ASelfExpr
 	super AExpr
-	readable writable var _n_kwself: nullable TKwself
+	var n_kwself: nullable TKwself is writable
 end
 
 # When there is no explicit receiver, `self` is implicit
@@ -1530,17 +1785,17 @@ end
 # A `true` boolean literal constant
 class ATrueExpr
 	super ABoolExpr
-	readable writable var _n_kwtrue: TKwtrue
+	var n_kwtrue: TKwtrue is writable, noinit
 end
 # A `false` boolean literal constant
 class AFalseExpr
 	super ABoolExpr
-	readable writable var _n_kwfalse: TKwfalse
+	var n_kwfalse: TKwfalse is writable, noinit
 end
 # A `null` literal constant
 class ANullExpr
 	super AExpr
-	readable writable var _n_kwnull: TKwnull
+	var n_kwnull: TKwnull is writable, noinit
 end
 # An integer literal
 class AIntExpr
@@ -1549,27 +1804,27 @@ end
 # An integer literal in decimal format
 class ADecIntExpr
 	super AIntExpr
-	readable writable var _n_number: TNumber
+	var n_number: TNumber is writable, noinit
 end
 # An integer literal in hexadecimal format
 class AHexIntExpr
 	super AIntExpr
-	readable writable var _n_hex_number: THexNumber
+	var n_hex_number: THexNumber is writable, noinit
 end
 # A float literal
 class AFloatExpr
 	super AExpr
-	readable writable var _n_float: TFloat
+	var n_float: TFloat is writable, noinit
 end
 # A character literal
 class ACharExpr
 	super AExpr
-	readable writable var _n_char: TChar
+	var n_char: TChar is writable, noinit
 end
 # A string literal
 abstract class AStringFormExpr
 	super AExpr
-	readable writable var _n_string: Token
+	var n_string: Token is writable, noinit
 end
 
 # A simple string. eg. `"abc"`
@@ -1593,64 +1848,72 @@ class AEndStringExpr
 end
 
 # A superstring literal. eg `"a{x}b{y}c"`
-# Each part is modelized a sequence of expression. eg. `["a{, x, }b{, y, }c"]`
+# Each part is modeled a sequence of expression. eg. `["a{, x, }b{, y, }c"]`
 class ASuperstringExpr
 	super AExpr
-	readable var _n_exprs: ANodes[AExpr] = new ANodes[AExpr](self)
+	var n_exprs = new ANodes[AExpr](self)
 end
 
 # A simple parenthesis. eg `(x)`
 class AParExpr
 	super AProxyExpr
-	readable writable var _n_opar: TOpar
-	readable writable var _n_cpar: TCpar
+	var n_opar: TOpar is writable, noinit
+	var n_cpar: TCpar is writable, noinit
 end
 
-# Whatevej just contains (and mimic) an other expression
+# Whatever just contains (and mimic) an other expression
 abstract class AProxyExpr
 	super AExpr
-	readable writable var _n_expr: AExpr
+	var n_expr: AExpr is writable, noinit
 end
 
 # A type cast. eg `x.as(T)`
 class AAsCastExpr
 	super AExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_kwas: TKwas
-	readable writable var _n_opar: nullable TOpar = null
-	readable writable var _n_type: AType
-	readable writable var _n_cpar: nullable TCpar = null
+	var n_expr: AExpr is writable, noinit
+	var n_kwas: TKwas is writable, noinit
+	var n_opar: nullable TOpar = null is writable
+	var n_type: AType is writable, noinit
+	var n_cpar: nullable TCpar = null is writable
 end
 
 # A as-not-null cast. eg `x.as(not null)`
 class AAsNotnullExpr
 	super AExpr
-	readable writable var _n_expr: AExpr
-	readable writable var _n_kwas: TKwas
-	readable writable var _n_opar: nullable TOpar = null
-	readable writable var _n_kwnot: TKwnot
-	readable writable var _n_kwnull: TKwnull
-	readable writable var _n_cpar: nullable TCpar = null
+	var n_expr: AExpr is writable, noinit
+	var n_kwas: TKwas is writable, noinit
+	var n_opar: nullable TOpar = null is writable
+	var n_kwnot: TKwnot is writable, noinit
+	var n_kwnull: TKwnull is writable, noinit
+	var n_cpar: nullable TCpar = null is writable
 end
 
 # A is-set check of old-style attributes. eg `isset x._a`
 class AIssetAttrExpr
 	super AAttrFormExpr
-	readable writable var _n_kwisset: TKwisset
+	var n_kwisset: TKwisset is writable, noinit
+end
+
+# An ellipsis notation used to pass an expression as it, in a vararg parameter
+class AVarargExpr
+	super AExpr
+	var n_expr: AExpr is writable, noinit
+	var n_dotdotdot: TDotdotdot is writable, noinit
 end
 
 # A list of expression separated with commas (arguments for instance)
 abstract class AExprs
 	super Prod 
-	readable var _n_exprs: ANodes[AExpr] = new ANodes[AExpr](self)
+	var n_exprs = new ANodes[AExpr](self)
 end
 
+# A special expression to debug types
 class ADebugTypeExpr
 	super AExpr
-	readable writable var _n_kwdebug: TKwdebug
-	readable writable var _n_kwtype: TKwtype
-	readable writable var _n_expr: AExpr
-	readable writable var _n_type: AType
+	var n_kwdebug: TKwdebug is writable, noinit
+	var n_kwtype: TKwtype is writable, noinit
+	var n_expr: AExpr is writable, noinit
+	var n_type: AType is writable, noinit
 end
 
 # A simple list of expressions
@@ -1661,116 +1924,145 @@ end
 # A list of expressions enclosed in parentheses
 class AParExprs
 	super AExprs
-	readable writable var _n_opar: TOpar
-	readable writable var _n_cpar: TCpar
+	var n_opar: TOpar is writable, noinit
+	var n_cpar: TCpar is writable, noinit
 end
 
 # A list of expressions enclosed in brackets
 class ABraExprs
 	super AExprs
-	readable writable var _n_obra: TObra
-	readable writable var _n_cbra: TCbra
+	var n_obra: TObra is writable, noinit
+	var n_cbra: TCbra is writable, noinit
 end
 
-# A complex assignment operator. eg `+=`
+# A complex assignment operator. (`+=` and `-=`)
 abstract class AAssignOp
 	super Prod
 end
+
+# The `+=` assignment operation
 class APlusAssignOp
 	super AAssignOp
-	readable writable var _n_pluseq: TPluseq
+	var n_pluseq: TPluseq is writable, noinit
 end
+
+# The `-=` assignment operator
 class AMinusAssignOp
 	super AAssignOp
-	readable writable var _n_minuseq: TMinuseq
+	var n_minuseq: TMinuseq is writable, noinit
 end
 
+# A possibly fully-qualified module identifier
 class AModuleName
 	super Prod
-	readable writable var _n_quad: nullable TQuad = null
-	readable var _n_path: ANodes[TId] = new ANodes[TId](self)
-	readable writable var _n_id: TId
+	var n_quad: nullable TQuad = null is writable
+	var n_path = new ANodes[TId](self)
+	var n_id: TId is writable, noinit
 end
+
+# A language declaration for an extern block
 class AInLanguage
 	super Prod
-	readable writable var _n_kwin: TKwin
-	readable writable var _n_string: TString
+	var n_kwin: TKwin is writable, noinit
+	var n_string: TString is writable, noinit
 end
+
+# An full extern block
 class AExternCodeBlock
 	super Prod
-	readable writable var _n_in_language: nullable AInLanguage = null
-	readable writable var _n_extern_code_segment: TExternCodeSegment
+	var n_in_language: nullable AInLanguage = null is writable
+	var n_extern_code_segment: TExternCodeSegment is writable, noinit
 end
+
+# A possible full method qualifier.
 class AQualified
 	super Prod
-	readable writable var _n_quad: nullable TQuad = null
-	readable var _n_id: ANodes[TId] = new ANodes[TId](self)
-	readable writable var _n_classid: nullable TClassid = null
+	var n_quad: nullable TQuad = null is writable
+	var n_id = new ANodes[TId](self)
+	var n_classid: nullable TClassid = null is writable
 end
 
 # A documentation of a definition
 # It contains the block of comments just above the declaration
 class ADoc
 	super Prod
-	readable var _n_comment: ANodes[TComment] = new ANodes[TComment](self)
+	var n_comment = new ANodes[TComment](self)
 end
 
+# A group of annotation on a node
 class AAnnotations
 	super Prod
-	readable writable var _n_at: nullable TAt = null
-	readable writable var _n_opar: nullable TOpar = null
-	readable var _n_items: ANodes[AAnnotation] = new ANodes[AAnnotation](self)
-	readable writable var _n_cpar: nullable TCpar = null
+	var n_at: nullable TAt = null is writable
+	var n_opar: nullable TOpar = null is writable
+	var n_items = new ANodes[AAnnotation](self)
+	var n_cpar: nullable TCpar = null is writable
 end
+
+# A single annotation
 class AAnnotation
 	super Prod
-	readable writable var _n_atid: AAtid
-	readable writable var _n_opar: nullable TOpar = null
-	readable var _n_args: ANodes[AAtArg] = new ANodes[AAtArg](self)
-	readable writable var _n_cpar: nullable TCpar = null
+	var n_doc: nullable ADoc = null is writable
+	var n_kwredef: nullable TKwredef = null is writable
+	var n_visibility: nullable AVisibility is writable
+	var n_atid: AAtid is writable, noinit
+	var n_opar: nullable TOpar = null is writable
+	var n_args = new ANodes[AAtArg](self)
+	var n_cpar: nullable TCpar = null is writable
 end
+
+# A single argument of an annotation
 abstract class AAtArg
 	super Prod
 end
+
+# A type-like argument of an annotation
 class ATypeAtArg
 	super AAtArg
-	readable writable var _n_type: AType
+	var n_type: AType is writable, noinit
 end
+
+# An expression-like argument of an annotation
 class AExprAtArg
 	super AAtArg
-	readable writable var _n_expr: AExpr
+	var n_expr: AExpr is writable, noinit
 end
+
+# An annotation-like argument of an annotation
 class AAtAtArg
 	super AAtArg
 end
+
+# An annotation name
 abstract class AAtid
 	super Prod
-	readable writable var _n_id: Token
+	var n_id: Token is writable, noinit
 end
+
+# An annotation name based on an identifier
 class AIdAtid
 	super AAtid
 end
+
+# An annotation name based on the keyword `extern`
 class AKwexternAtid
 	super AAtid
 end
-class AKwinternAtid
-	super AAtid
-end
-class AKwreadableAtid
-	super AAtid
-end
-class AKwwritableAtid
+
+# An annotation name based on the keyword `import`
+class AKwimportAtid
 	super AAtid
 end
-class AKwimportAtid
+
+# An annotation name based on the keyword `abstract`
+class AKwabstractAtid
 	super AAtid
 end
 
 # The root of the AST
 class Start
 	super Prod
-	readable writable var _n_base: nullable AModule
-	readable writable var _n_eof: EOF
+	var n_base: nullable AModule is writable
+	var n_eof: EOF is writable, noinit
 	init(n_base: nullable AModule, n_eof: EOF)
 	do
 		self._n_base = n_base