[Issue 7738] New: Can't iterate a std.typecons.Typedef!(int[]) with foreach

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7738

           Summary: Can't iterate a std.typecons.Typedef!(int[]) with
                    foreach
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2012-03-19 17:33:07 PDT ---
This compiles in DMD 2.059head:

alias int[] MyArray;
void main() {
    MyArray arr;
    foreach (i, item; arr) {}
}



This doesn't compile:

import std.typecons: Typedef;
alias Typedef!(int[]) MyArray;
void main() {
    MyArray arr;
    foreach (i, item; arr) {}
}

DMD 2.059head gives the error:

test.d(5): Error: invalid foreach aggregate arr


This simpler code gives the same error:

import std.typecons: Typedef;
alias Typedef!(int[]) MyArray;
void main() {
    MyArray arr;
    foreach (item; arr) {}
}


My main use cases for typedef are with arrays. So this problem makes
std.typecons.Typedef not much useful.

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