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rustdoc: don't panic when the cross-re-export handler sees a proc-macro When i moved the macro cross-re-export inlining code into `clean::inline`, i thought that if a macro had a `Def` that said it was a bang macro, it wouldn't be a proc macro. I thought wrong. Turns out, the `quote!()` in `libproc_macro` is actually a proc-macro, and when the `quote!()` macro is re-exported, this proc-macro is accessed in its place. This causes any `proc_macro::*` glob re-export to pull in this proc-macro, causing the assertion i added to fire, leading to an ICE. This replaces that with an Option that ignores proc-macros for the time being. Fixes https://github.com/rust-lang/rust/issues/52129