http://d.puremagic.com/issues/show_bug.cgi?id=6474

           Summary: aliasing type tuple elements' members is onerous
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: ellery-newcomer@utulsa.edu


--- Comment #0 from Ellery Newcomer <ellery-newcomer@utulsa.edu> 2011-08-11 19:32:04 PDT ---
code like

struct X(T){
    alias T TT;
}
alias TypeTuple!(int,int, X!string) G;
alias G[2].TT TT; // <-- parse failure

doesn't work. It's just not built in to the D grammar.

Of course, the workaround is simply

alias G[2] G2;
alias G2.TT TT;

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |bearophile_hugs@eml.cc


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-02-08 15:28:59 PST ---
*** Issue 5697 has been marked as a duplicate of this issue. ***

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--- Comment #2 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-02-10 09:10:37 PST ---
*** Issue 6740 has been marked as a duplicate of this issue. ***

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--- Comment #3 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-03-31 13:36:42 PDT ---
Just pasting this here as I've ran into it again:

template test(T, Preds...)
{
    enum bool test = Preds[0]!T;  // error: semicolon expected, not '!'
}

A workaround is to use an alias:

template test(T, Preds...)
{
    alias Pred = Preds[0];
    enum bool test = Pred!T;
}

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