[Issue 7621] New: Immutable type equivalence problem

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7621

           Summary: Immutable type equivalence problem
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2012-03-01 13:14:49 PST ---
I don't understand this bug. D2 code:


void main() {
    enum uint N = 4u;
    char[] A = "hello".dup;
    uint[immutable char[N]] dict;
    dict[*cast(immutable char[4]*)(A[0 .. N].ptr)] = 0; // OK
    dict[*cast(immutable char[N]*)(A[0 .. N].ptr)] = 0; // line 6, error
}


DMD 2.059head gives:

test.d(6): Error: cannot implicitly convert expression
(*cast(immutable(char[N]*))cast(char*)A[0u..4u]) of type immutable(char[N]) to
immutable(char[4u])

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