tree 109e3227f1b4076c99874c94dc9aa1d554781f2b
parent 8bf776d5c2fc88624d2562e493aab0d324a3b7d8
parent 8ab67c8f560a730b8978f4a42deb70d01ca1cdfc
author bors <bors@rust-lang.org> 1568535477 +0000
committer bors <bors@rust-lang.org> 1568535477 +0000

Auto merge of #64469 - matthewjasper:increase-hygiene-use, r=petrochenkov

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