update documentation of recheck about top-level boxes

scala · Oct 4, 2022 · 1bbc604 · 1bbc604
1 parent 9306894
commit 1bbc604
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/compiler/src/dotty/tools/dotc/cc/CheckCaptures.scala b/compiler/src/dotty/tools/dotc/cc/CheckCaptures.scala
@@ -508,7 +508,8 @@ class CheckCaptures extends Recheck, SymTransformer:
         case _: RefTree => true
         case _          => false
 
-    /** If expected type `pt` is boxed, don't propagate free variables.
+    /** If expected type `pt` is boxed and the tree is a function or a reference,
+     *  don't propagate free variables.
      *  Otherwise, if the result type is boxed, simulate an unboxing by
      *  adding all references in the boxed capture set to the current environment.
      */