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-rw-r--r--src/librustc/ty/query/mod.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/librustc/ty/query/mod.rs b/src/librustc/ty/query/mod.rs
index ef5a98e6ecb..6bf99a98d4e 100644
--- a/src/librustc/ty/query/mod.rs
+++ b/src/librustc/ty/query/mod.rs
@@ -476,7 +476,8 @@ define_queries! { <'tcx>
 
         [] fn foreign_modules: ForeignModules(CrateNum) -> Lrc<Vec<ForeignModule>>,
 
-        // For a library crate, this is always none
+        /// Identifies the entry-point (e.g. the `main` function) for a given
+        /// crate, returning `None` if there is no entry point (such as for library crates).
         [] fn entry_fn: EntryFn(CrateNum) -> Option<(DefId, EntryFnType)>,
         [] fn plugin_registrar_fn: PluginRegistrarFn(CrateNum) -> Option<DefId>,
         [] fn proc_macro_decls_static: ProcMacroDeclsStatic(CrateNum) -> Option<DefId>,