Auto merge of #132027 - RalfJung:lang-feature-bool-fields, r=nnethercote

nightly feature tracking: get rid of the per-feature bool fields

The `struct Features` that tracks which features are enabled has a ton of public `bool`-typed fields that are basically caching the result of looking up the corresponding feature in `enabled_lang_features`. Having public fields with an invariant is not great, so at least they should be made private. However, it turns out caching these lookups is actually [not worth it](https://github.com/rust-lang/rust/pull/131321#issuecomment-2402068336), so this PR just entirely gets rid of these fields. (The alternative would be to make them private and have a method for each of them to expose them in a read-only way. Most of the diff of this PR would be the same in that case.)

r? `@nnethercote`

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_expand/src/expand.rs b/compiler/rustc_expand/src/expand.rs
index a872b12e744..5ffafcaa542 100644
--- a/compiler/rustc_expand/src/expand.rs
+++ b/compiler/rustc_expand/src/expand.rs
@@ -867,7 +867,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             | Annotatable::FieldDef(..)
             | Annotatable::Variant(..) => panic!("unexpected annotatable"),
         };
-        if self.cx.ecfg.features.proc_macro_hygiene {
+        if self.cx.ecfg.features.proc_macro_hygiene() {
             return;
         }
         feature_err(
@@ -905,7 +905,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             }
         }
 
-        if !self.cx.ecfg.features.proc_macro_hygiene {
+        if !self.cx.ecfg.features.proc_macro_hygiene() {
             annotatable.visit_with(&mut GateProcMacroInput { sess: &self.cx.sess });
         }
     }