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-rw-r--r--compiler/rustc_session/src/code_stats.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_session/src/code_stats.rs b/compiler/rustc_session/src/code_stats.rs
index 6b18d450e9e..80603b4a156 100644
--- a/compiler/rustc_session/src/code_stats.rs
+++ b/compiler/rustc_session/src/code_stats.rs
@@ -72,6 +72,8 @@ pub struct TypeSizeInfo {
 
 #[derive(Default)]
 pub struct CodeStats {
+    /// The hash set that actually holds all the type size information.
+    /// The field is public for use in external tools. See #139876.
     pub type_sizes: Lock<FxHashSet<TypeSizeInfo>>,
 }