Bug 5856 – overloading on const doesn't work for operator overload

import std.stdio; struct X { void f() { writeln("X.f mutable"); } void f() const { writeln("X.f const"); } void g()() { writeln("X.g mutable"); } void g()() const { writeln("X.g const"); } void opOpAssign(string op)(int n) { writeln("X+= mutable"); } void opOpAssign(string op)(int n) const { writeln("X+= const"); } } void main() { X xm; xm.f(); // prints "X.f mutable" xm.g(); // prints "X.g mutable" xm += 10; // should print "X+= mutable" (1) const(X) xc; xc.f(); // prints "X.f const" xc.g(); // prints "X.g const" xc += 10; // should print "X+= const" (2) } Compiling this code occurs ambiguous error on line (1) and (2). I think issue 3810 is related.

Created attachment 949 testcase patch pull requested: https://github.com/D-Programming-Language/dmd/pull/42