Add note to TyS::needs_drop about union dependency on it

For now, part of unstable feature untagged_unions.
rust-lang · Jan 13, 2019 · 87c66a8 · 87c66a8
1 parent f4b2d71
commit 87c66a8
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/librustc/ty/util.rs b/src/librustc/ty/util.rs
@@ -740,6 +740,8 @@ impl<'a, 'tcx> ty::TyS<'tcx> {
     ///
     /// (Note that this implies that if `ty` has a destructor attached,
     /// then `needs_drop` will definitely return `true` for `ty`.)
+    ///
+    /// Note that this method is used to check eligible types in unions.
     #[inline]
     pub fn needs_drop(&'tcx self,
                       tcx: TyCtxt<'a, 'tcx, 'tcx>,