[Issue 12527] New: Cannot make @system function/delegate alias in a @safe section

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12527

           Summary: Cannot make @system function/delegate alias in a @safe
                    section
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bugzilla at kyllingen.net


--- Comment #0 from Lars T. Kyllingstad <bugzilla at kyllingen.net> 2014-04-06 07:25:09 PDT ---
Consider the following:

    @safe:
    alias Fun = void function() @system;
    pragma (msg, Fun.stringof);
    alias Del = void delegate() @system;
    pragma (msg, Del.stringof);

When compiling this, DMD prints:

    void function() @safe
    void delegate() @safe

In other words, the @safe: directive somehow prevents the @system attribute
from becoming part of the alias.  Here is a test case which should compile, but
which doesn't:

    @safe:
    alias Fun = void function() @system;
    @system void foo() { }
    @trusted void bar(Fun fun) { fun(); }
    void main() { bar(&foo); }

This fails with the following error message:

bug.d(5): Error: function bug.bar (void function() @safe fun) is not callable
using argument types (void function() @system)

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