http://d.puremagic.com/issues/show_bug.cgi?id=8813

           Summary: Cannot define delegate with
                    const/immutable/shared/inout attributes
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: zan77137@nifty.com


--- Comment #0 from SHOO <zan77137@nifty.com> 2012-10-13 11:05:38 PDT ---
This code doesn't work:
-----------------------
void main()
{
    auto dg = delegate() const { }; // NG
}
-----------------------

And, I do not know whether a cause is the same as this problem... This code doesn't work, too.
-----------------------
import std.traits;
void main()
{
    static assert(is(FunctionTypeOf!(void delegate() const) == const)); // NG

    alias void delegate() const DG; // OK
    static assert(is(FunctionTypeOf!DG == const)); // OK
}
-----------------------

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http://d.puremagic.com/issues/show_bug.cgi?id=8813



--- Comment #1 from Kenji Hara <k.hara.pg@gmail.com> 2012-10-14 20:50:28 PDT ---
(In reply to comment #0)
> This code doesn't work:
> -----------------------
> void main()
> {
>     auto dg = delegate() const { }; // NG
> }
> -----------------------

In current, the semantics about qualified nested function (==lambda literal) is not defined in language spec. Compiler assumes that the frame pointer of nested function is always mutable.

> And, I do not know whether a cause is the same as this problem... This code doesn't work, too.
> -----------------------
> import std.traits;
> void main()
> {
>     static assert(is(FunctionTypeOf!(void delegate() const) == const)); // NG
> 
>     alias void delegate() const DG; // OK
>     static assert(is(FunctionTypeOf!DG == const)); // OK
> }
> -----------------------

This is a parser bug and a rest of issue 4838.
I've separated it to bug 8822.

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