Remove some mentions of gensyms

Author: matthewjasper

src/librustc/ty/print/pretty.rs

@@ -1480,7 +1480,7 @@ impl<F: fmt::Write> FmtPrinter<'_, 'tcx, F> {
         }
 
         // Replace any anonymous late-bound regions with named
-        // variants, using gensym'd identifiers, so that we can
+        // variants, using new unique identifiers, so that we can
         // clearly differentiate between named and unnamed regions in
         // the output. We'll probably want to tweak this over time to
         // decide just how much information to give.

src/libsyntax/ext/proc_macro_server.rs

@@ -332,8 +332,7 @@ 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 }