[Issue 21451] New: __traits(compiles, ...) is wrong on overloaded templates instantiated with empty parens

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21451

          Issue ID: 21451
           Summary: __traits(compiles, ...) is wrong on overloaded
                    templates instantiated with empty parens
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: qs.il.paperinik at gmail.com

Since 2.064, the assert with // ??? succeeds. 
>From 2.060 to 2.063, the respective assert fails as expected.

void f(int a : 1)() { }
void f(int b : 2)(int x) { }

void main()
{
    static assert( __traits(compiles, f!1 ));
    static assert( __traits(compiles, f!1() ));
    static assert( __traits(compiles, f!2(2) ));
    static assert(!__traits(compiles, f!(1, 2) ));
    static assert( __traits(compiles, f!() )); // ???
    static assert(!__traits(compiles, { f!(); }));
}

The marked assert shouldn't compile.

--