http://d.puremagic.com/issues/show_bug.cgi?id=10648

           Summary: std.traits.isMutable is true for struct defined
                    immutable
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2013-07-15 10:13:33 PDT ---
With dmd 2.064alpha this code runs with no assert errors:


import std.traits: isMutable;
immutable struct Foo {}
void main () {
    static assert(isMutable!Foo);
}



Issue found by JS: http://forum.dlang.org/thread/xjpfwfydzxxwqisvqudw@forum.dlang.org

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http://d.puremagic.com/issues/show_bug.cgi?id=10648


Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #1 from Kenji Hara <k.hara.pg@gmail.com> 2013-07-15 18:07:35 PDT ---
(In reply to comment #0)
> With dmd 2.064alpha this code runs with no assert errors:
> 
> 
> import std.traits: isMutable;
> immutable struct Foo {}
> void main () {
>     static assert(isMutable!Foo);
> }
> 
> 
> 
> Issue found by JS: http://forum.dlang.org/thread/xjpfwfydzxxwqisvqudw@forum.dlang.org

It is not an issue. Because:

1. Qualified struct declaration and its behavior is properly documented.
 http://dlang.org/struct#ConstStruct

2. The struct name `Foo` always represent 'mutable type Foo'. And, isMutable tests whether the type qualifier is mutable or not.

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