Add a static size assertion for MatcherPos.

rust-lang · Mar 3, 2022 · b9fabc3 · b9fabc3
1 parent 11c565f
commit b9fabc3
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/compiler/rustc_expand/src/mbe/macro_parser.rs b/compiler/rustc_expand/src/mbe/macro_parser.rs
@@ -207,6 +207,10 @@ struct MatcherPos<'root, 'tt> {
     stack: SmallVec<[MatcherTtFrame<'tt>; 1]>,
 }
 
+// This type is used a lot. Make sure it doesn't unintentionally get bigger.
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+rustc_data_structures::static_assert_size!(MatcherPos<'_, '_>, 192);
+
 impl<'root, 'tt> MatcherPos<'root, 'tt> {
     /// Adds `m` as a named match for the `idx`-th metavar.
     fn push_match(&mut self, idx: usize, m: NamedMatch) {