• d-bugmail puremagic.com (56/56) Jul 03 2013 http://d.puremagic.com/issues/show_bug.cgi?id=10533

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=10533

           Summary: Bad diagnostic when template has alias overloads
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: andrej.mitrovich gmail.com



18:59:28 PDT ---
-----
struct S1
{
    T get(T)() if (is(T == float)) { }
}

struct S2
{
    auto get(alias value)()
    {
        return S1.get!(typeof(value));
    }
}

struct S3
{
    auto get(alias value)()
    {
        return get!(typeof(value));
    }

    T get(T)() if (is(T == float))
    {
        return T.init;
    }
}

void main()
{
    // Error: template instance get!int does not match template declaration
get(T)() if (is(T == float))
    S1.get!int;

    // Error: template instance get!int does not match template declaration
get(T)() if (is(T == float))
    S2.get!1;

    // Error: cannot resolve type for this.get!int
    S3.get!1;
}
-----

Observations:

S2.get calls into S1.get, and creates a nice error message. However in S3 the
get templates are overloaded against each other, and this causes the diagnostic
to become bad. S3.get should have the same diagnostic as S2.get.

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