A limited hierarchy like Go's could be OK: parens (...) paths . [] and args (x,y) unary ! - binary * / & binary + - | binary == != <=

A limited hierarchy like Go's could be OK: parens (...) paths . [] and args (x,y) unary ! - binary * / & binary + - | binary == != <= >= < > binary && binary || comma , assign = += -= *= /= &= |= :=