Make yield in singleton class definitions in methods a SyntaxError

This behavior was deprecated in 2.7 and scheduled to be removed
in 3.0.

Calling yield in a class definition outside a method is now a
SyntaxError instead of a LocalJumpError, as well.

1 files changed, 2 insertions, 0 deletions

diff --git a/NEWS.md b/NEWS.md
index f6bd2a4bb2..22943d64a7 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -12,6 +12,8 @@ sufficient information, see the ChangeLog file or Redmine
 
 * $SAFE is now a normal global variable with no special behavior. [Feature #16131]
 
+* yield in singleton class definitions in methods is now a SyntaxError. [Feature #15575]
+
 ## Command line options
 
 ## Core classes updates (outstanding ones only)