[Issue 5601] New: A template forward reference error

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5601

           Summary: A template forward reference error
           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 2011-02-16 16:20:11 PST ---
A case of forward template forward reference (I am not sure this is actually a
bug):


import std.traits;
auto foo() {
    alias ReturnType!foo T;
    return 0;
}
void main() {}


DMD 2.052 shows (it's not a regression):

...\dmd\src\phobos\std\traits.d(122): Error: template instance forward
reference of foo
...\dmd\src\phobos\std\traits.d(105): Error: forward reference to foo
...\dmd\src\phobos\std\traits.d(122): Error: template instance
std.traits.staticLength!(foo) error instantiating

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