Cleanup handling of hygiene for built-in macros #64469
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r=me with Centril's comment addressed |
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Cleanup handling of hygiene for built-in macros
This makes most identifiers generated by built-in macros use def-site hygiene, not only the ones that previously used gensyms.
* `ExtCtxt::ident_of` now takes a `Span` and is preferred to `Ident::{from_str, from_str_and_span}`
* Remove `Span::with_legacy_ctxt`
* `assert` now uses call-site hygiene because it needs to resolve `panic` unhygienically.
* `concat_idents` now uses call-site hygiene because it wouldn't be very useful with def-site hygiene.
* everything else is moved to def-site hygiene
r? @petrochenkov
| let sp = cx.with_legacy_ctxt(sp); | ||
| // `core::panic` and `std::panic` are different macros, so we use call-site | ||
| // context to pick up whichever is currently in scope. | ||
| let sp = cx.with_call_site_ctxt(sp); |
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I'd rather use the call-site span in a more targeted way though, for the panic identifier specifically, and def-site for everything else.
(Not sure if this makes observable difference in this case, but it's a safer default.)
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This makes most identifiers generated by built-in macros use def-site hygiene, not only the ones that previously used gensyms.
ExtCtxt::ident_ofnow takes aSpanand is preferred toIdent::{from_str, from_str_and_span}Span::with_legacy_ctxtassertnow uses call-site hygiene because it needs to resolvepanicunhygienically.concat_identsnow uses call-site hygiene because it wouldn't be very useful with def-site hygiene.r? @petrochenkov