Issue #18518: timeit now rejects statements which can't be compiled outside

a function or a loop (e.g. "return" or "break").

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/timeit.py b/Lib/timeit.py
index 5971d37..3807794 100755
--- a/Lib/timeit.py
+++ b/Lib/timeit.py
@@ -115,6 +115,12 @@ class Timer:
         local_ns = {}
         global_ns = _globals() if globals is None else globals
         if isinstance(stmt, str):
+            # Check that the code can be compiled outside a function
+            if isinstance(setup, str):
+                compile(setup, dummy_src_name, "exec")
+                compile(setup + '\n' + stmt, dummy_src_name, "exec")
+            else:
+                compile(stmt, dummy_src_name, "exec")
             stmt = reindent(stmt, 8)
             if isinstance(setup, str):
                 setup = reindent(setup, 4)