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-rw-r--r--src/reflect/scala/reflect/api/Symbols.scala3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/reflect/scala/reflect/api/Symbols.scala b/src/reflect/scala/reflect/api/Symbols.scala
index dddd3c0e61..42cf600c85 100644
--- a/src/reflect/scala/reflect/api/Symbols.scala
+++ b/src/reflect/scala/reflect/api/Symbols.scala
@@ -260,6 +260,9 @@ trait Symbols { self: Universe =>
* with an object definition (module class in scala compiler parlance).
* If yes, `isType` is also guaranteed to be true.
*
+ * Note to compiler developers: During the "mixin" phase, trait implementation class symbols
+ * receive the `lateMODULE` flag, hence `isImplClass && isModuleClass` becomes true.
+ *
* @group Tests
*/
def isModuleClass: Boolean = false