[Issue 21074] New: const lost in mixin

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21074

          Issue ID: 21074
           Summary: const lost in mixin
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: tim.dlang at t-online.de

The following code fails:

alias Byte = ubyte;
alias T = mixin(q{const(Byte)})*;
static assert(is(T==const(ubyte)*)); // fails

Dmd v2.091.1 produces the error message:

Error: static assert:  is(ubyte* == const(ubyte)*) is false

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