-Zmacro-backtrace
For macros that are implemented on the compiler, we do *not* mention the `-Zmacro-backtrace` flag. This includes `derive`s and standard macros.
derive
Do not suggest ``` help: use parentheses to call these | 5 | (callback: Rc<dyn Fn()>)(), | + +++ ``` Skip all "call function for this binop" suggestions when in a derive context. Fix #135989.