http://d.puremagic.com/issues/show_bug.cgi?id=10683

           Summary: std.range.join of an array of array of tuple of string
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2013-07-20 11:38:02 PDT ---
import std.typecons: tuple;
import std.range: join;
void main() {
    auto r1 = [[tuple(1)]].join; // OK
    auto r2 = [[tuple("x")]].join; // Error
}


DMD 2.064alpha gives:
core.exception.AssertError@std.algorithm(1923): Assertion failure

I think this used to work.

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