nullable: convert lib, tools and tests

[nit.git] / lib / standard / string.nit

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index 3b0065c..a55e72a 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -188,7 +188,6 @@ special AbstractString
        redef meth ==(o)
        do
                if not o isa String or o is null then return false
-               assert o isa String
                var l = length
                if o.length != l then return false
                var i = 0
@@ -359,7 +358,6 @@ special AbstractArray[Char]
        redef meth ==(o)
        do
                if not o isa Buffer or o is null then return false
-               assert o isa Buffer
                var l = length
                if o.length != l then return false
                var i = 0
@@ -589,14 +587,14 @@ class StringCapable
 end
 
 redef class Sys
-       attr _args_cache: IndexedCollection[String]
+       attr _args_cache: nullable IndexedCollection[String]
 
        redef meth args: IndexedCollection[String]
        do
                if _args_cache == null then init_args
-               return _args_cache
+               return _args_cache.as(not null)
        end
-       
+
        # The name of the program as given by the OS
        meth program_name: String
        do