[Issue 7686] New: template argument ignored with specialization for dependent parameter

d-bugmail at puremagic.com d-bugmail at puremagic.com
Sun Mar 11 09:58:08 PDT 2012


http://d.puremagic.com/issues/show_bug.cgi?id=7686

           Summary: template argument ignored with specialization for
                    dependent parameter
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dawg at dawgfoto.de


--- Comment #0 from dawg at dawgfoto.de 2012-03-11 09:58:11 PDT ---
cat > bug.d << CODE
struct Pair(T1, T2) {}

template foo(T : Pair!(T, U), U)
{
    pragma(msg, "foo ", T, U);
}

template bar(T : Pair!(T, U), U:int)
{
    pragma(msg, "bar ", T, U);
}

static assert(!__traits(compiles, foo!(Pair!(double, short), int))); // OK
static assert(!__traits(compiles, bar!(Pair!(double, short), int))); // fails
CODE

dmd -c bug

--------

For bar the argument to U is ignored and U is deduced from Pair.

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