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

diff --git a/src/interpreter/naive_interpreter.nit b/src/interpreter/naive_interpreter.nit
index aba779a..4cab2e5 100644
--- a/src/interpreter/naive_interpreter.nit
+++ b/src/interpreter/naive_interpreter.nit
@@ -1001,11 +1001,11 @@ redef class AMethPropdef
 			else if pname == "file_exists" then
 				return v.bool_instance(recvval.to_s.file_exists)
 			else if pname == "file_mkdir" then
-				recvval.to_s.mkdir
-				return null
+				var res = recvval.to_s.mkdir
+				return v.bool_instance(res == null)
 			else if pname == "file_chdir" then
-				recvval.to_s.chdir
-				return null
+				var res = recvval.to_s.chdir
+				return v.bool_instance(res == null)
 			else if pname == "file_realpath" then
 				return v.native_string_instance(recvval.to_s.realpath)
 			else if pname == "get_environ" then
@@ -1016,6 +1016,9 @@ redef class AMethPropdef
 				return v.int_instance(res)
 			else if pname == "atof" then
 				return v.float_instance(recvval.to_f)
+			else if pname == "fast_cstring" then
+				var ns = recvval.to_cstring.to_s.substring_from(args[1].to_i)
+				return v.native_string_instance(ns)
 			end
 		else if cname == "String" then
 			var cs = v.send(v.force_get_primitive_method("to_cstring", args.first.mtype), [args.first])
@@ -1270,14 +1273,16 @@ redef class ABlockExpr
 end
 
 redef class AVardeclExpr
-	redef fun stmt(v)
+	redef fun expr(v)
 	do
 		var ne = self.n_expr
 		if ne != null then
 			var i = v.expr(ne)
-			if i == null then return
+			if i == null then return null
 			v.write_variable(self.variable.as(not null), i)
+			return i
 		end
+		return null
 	end
 end
 
@@ -1318,6 +1323,14 @@ redef class ASelfExpr
 	end
 end
 
+redef class AImplicitSelfExpr
+	redef fun expr(v)
+	do
+		if not is_sys then return super
+		return v.mainobj
+	end
+end
+
 redef class AEscapeExpr
 	redef fun stmt(v)
 	do
@@ -1462,6 +1475,19 @@ redef class AForExpr
 	end
 end
 
+redef class AWithExpr
+	redef fun stmt(v)
+	do
+		var expr = v.expr(self.n_expr)
+		if expr == null then return
+
+		v.callsite(method_start, [expr])
+		v.stmt(self.n_block)
+		v.is_escape(self.break_mark) # Clear the break
+		v.callsite(method_finish, [expr])
+	end
+end
+
 redef class AAssertExpr
 	redef fun stmt(v)
 	do