[Issue 4444] New: Cannot index built-in array with expression tuple

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4444

           Summary: Cannot index built-in array with expression tuple
           Product: D
           Version: 2.041
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: spec
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: rsinfu at gmail.com


--- Comment #0 from Shin Fujishiro <rsinfu at gmail.com> 2010-07-10 11:52:05 PDT ---
Expression tuples cannot be used for indexing built-in arrays:
--------------------
import std.typetuple;
void main()
{
    alias TypeTuple!(1) index;
    auto arr = new int[4];
    auto x = arr[index];    // error
}
--------------------
% dmd -o- -c test
test.d(6): Error: cannot implicitly convert expression (tuple(1)) of type (int)
to uint
--------------------

While overloaded opIndex accepts expression tuple.
--------------------
import std.typetuple;
void main()
{
    alias TypeTuple!(1) index;
    S s;
    auto x = s[index];      // okay
}
struct S
{
    size_t opIndex(size_t i) { return i; }
}
--------------------

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