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digitalmars.D.bugs - [Issue 7686] New: template argument ignored with specialization for dependent parameter

reply d-bugmail puremagic.com writes:
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 puremagic.com
        ReportedBy: dawg dawgfoto.de


--- Comment #0 from dawg 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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parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7686



--- Comment #1 from dawg dawgfoto.de 2012-03-11 11:48:11 PDT ---
cat > bug.d << CODE
struct Pair(T1, T2) {}

template foo(T : Pair!(T, U), U)
{
    enum val = 0;
}

template foo(T : Pair!(T, U), U:int)
{
    enum val = 1;
}

static assert(foo!(Pair!(int, int)).val == 1);   // FAIL - matches both
static assert(foo!(Pair!(int, short)).val == 1); // FAIL - matches the first
static assert(foo!(Pair!(int, float)).val == 0); // OK   - matches the first
CODE

dmd -c bug

--------

This also behaves incorrect for specialized overloads.

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