Rollup merge of #64623 - matthewjasper:underscore-imports, r=petrochenkov

Remove last uses of gensyms

Underscore bindings now use unique `SyntaxContext`s to avoid collisions. This was the last use of gensyms in the compiler, so this PR also removes them.

closes #49300
cc #60869

r? @petrochenkov

1 files changed, 1 insertions, 2 deletions

diff --git a/src/libsyntax/ext/proc_macro_server.rs b/src/libsyntax/ext/proc_macro_server.rs
index 300523c1b0a..e0e1a1c468c 100644
--- a/src/libsyntax/ext/proc_macro_server.rs
+++ b/src/libsyntax/ext/proc_macro_server.rs
@@ -334,8 +334,7 @@ impl Ident {
         if !Self::is_valid(&string) {
             panic!("`{:?}` is not a valid identifier", string)
         }
-        // Get rid of gensyms to conservatively check rawness on the string contents only.
-        if is_raw && !sym.as_interned_str().as_symbol().can_be_raw() {
+        if is_raw && !sym.can_be_raw() {
             panic!("`{}` cannot be a raw identifier", string);
         }
         Ident { sym, is_raw, span }