Guillaume Gomez d12b16887b
Rollup merge of #86726 - sexxi-goose:use-diagnostic-item-for-rfc2229-migration, r=nikomatsakis
Use diagnostic items instead of lang items for rfc2229 migrations

This PR removes the `Send`, `UnwindSafe` and `RefUnwindSafe` lang items introduced in https://github.com/rust-lang/rust/pull/84730, and uses diagnostic items instead to check for `Send`, `UnwindSafe` and `RefUnwindSafe` traits for RFC2229 migrations.

r? ```@nikomatsakis```
2021-07-08 18:30:33 +02:00
..
2021-06-22 00:40:47 +08:00
2021-06-28 11:30:49 -04:00
2021-06-11 12:25:02 +02:00
2021-07-06 11:28:06 +02:00