Bug 3941 – quirks of overloading function templates complicate the new operator overloading

struct Vector2(T) { T x; T y; /// element-wise operations, +, -, Vector2 opBinary(string op)(ref Vector2 v) { mixin("return Vector2!(T)( cast(T)(x " ~ op ~ " v.x), cast(T)(y " ~ op ~ " v.y) );"); } /// operation with scalar Vector2 opBinary(string op)(int i) { mixin("return Vector2!(T) ( cast(T)(x " ~ op ~ " i), cast(T)(y " ~ op ~ " i) );"); } } void main() { auto v = Vector2!(float)(0f,0f) + Vector2!(float)(1f,1f); } yields: template instance opBinary!("+") matches more than one template declaration This can be worked around with: opBinary(string op, U:Vector2)(U v) opBinary(string op, U:int)(U v) Solutions could be: (1) Something like template fn(string op) { fn(args1) {...} fn(args2) {...} } could work if a + b was rewritten as x.opBinary!("+").opBinary(b); (2) the best solution would of course be to detect such function template overloads directly!

Can't reproduce in 2.057, I guess it's fixed. Reopen if necessary.