[Issue 19476] New: explicit mixin template function call results in recursive call instead

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19476

          Issue ID: 19476
           Summary: explicit mixin template function call results in
                    recursive call instead
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dkorpel at live.nl

Context at https://forum.dlang.org/post/bopolkyyykbrfjymhcjb@forum.dlang.org

Code:
```
mixin template operators() {
    S opBinary(string op, T)(T rhs) {
        return rhs;
    }
}

struct S {
    mixin operators ops;
    S opBinary(string op, T)(T a) {
        return ops.opBinary!op(a);
    }
}

void main() {
    S.init.opBinary!"+"(S.init);
}
```

Expected:
The call `ops.opBinary` to refer to the mixin template.

Actual: 
A recursive call is made resulting in stack overflow.

When doing `alias opBinary = ops.opBinary` before the call it does work
correctly.

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