https://issues.dlang.org/show_bug.cgi?id=14344

          Issue ID: 14344
           Summary: [REG2.067] Wrong opBinary call in construction
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: rejects-valid
          Severity: regression
          Priority: P1
         Component: DMD
          Assignee: nobody@puremagic.com
          Reporter: k.hara.pg@gmail.com

Issue case:

struct CSSScale {
  CSSScale opBinary(string op)(CSSScale v) {
    static assert(op != "=");    // line 3
    assert(0);
  }
}

struct CSSScaleMix {
  CSSScale cssScaleA;
  alias cssScaleA this;
}

class TextHighlighter {
  CSSScaleMix height () {assert(0);}
  void update() {
    CSSScale height = this.height;    // line 16
  }
}

Output:
test.d(3): Error: static assert  ("=" != "=") is false
test.d(16):        instantiated from here: opBinary!"="

The regression introduced in: https://github.com/D-Programming-Language/dmd/pull/4054

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