[Issue 9046] New: typeof(T.init) should have the type T

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9046

           Summary: typeof(T.init) should have the type T
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: k.hara.pg at gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg at gmail.com> 2012-11-18 19:55:20 PST ---
All T's built-in property init should have an exact same type as T.
But, in current, enum and non-nested struct have broken this principle.

Test case. All is(typeof(U.init) == U) should print 'true'.
----
import std.traits, std.typetuple;
void main()
{
    enum E { x, y }
    int i;
    static struct S {}
    static class  C {}
    struct NS { void f(){ i++; } }
    class  NC { void f(){ i++; } }
    foreach (T; TypeTuple!(E, S, C, NS, NC))
    foreach (U; TypeTuple!(T, const T, immutable T, shared T, shared const T,
inout T, shared inout T))
    {
        pragma(msg, U, ": ", typeof(U.init), " -> ", is(typeof(U.init) == U));
    }
}

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