Running ra on the product of "Expand macro recursively at caret"?

[gxtaillon]

I'm working with macro_rules that output over 1kloc per callsite and not having any hints in the macro expansion is a pain point.

At this time I'm limited to:

1. Expand the macro_rules
2. Copy the output to a new module
3. Reimport everything that was in scope.
4. Comment out the original macro invocation to avoid duplicate symbol errors.

It works except whenever there are std macros mixed in. Macros like format! expand to alloc::__export::must_use which drowns-out interesting hints with errors like "use of unstable library feature hint_must_use".

Is there a way to get around that on stable?

If RA could be configured to not expand std macros and to copy over whatever imports are in scope at the macro callsite, in the macro expansion, that might be enough to have much better DX with macro_rules.

Thank you for RA, it's the best.

[ChayimFriedman2]

You can try the assist "Inline macro", which expands the macro once. It is not available for attribute/derive macros, though.

You may also be interested in #19130.