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-rw-r--r--Misc/NEWS4
-rwxr-xr-xTools/clinic/clinic.py6
2 files changed, 10 insertions, 0 deletions
diff --git a/Misc/NEWS b/Misc/NEWS
index d73137eb40..d6be619d2f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -72,6 +72,10 @@ Tests
Tools/Demos
-----------
+- Issue #20196: Fixed a bug where Argument Clinic did not generate correct
+ parsing code for functions with positional-only parameters where all arguments
+ are optional.
+
- Issue #18960: 2to3 and the findnocoding.py script now ignore the source
encoding declaration on the second line if the first line contains anything
except a comment.
diff --git a/Tools/clinic/clinic.py b/Tools/clinic/clinic.py
index 421b9e3d39..cd7c597f53 100755
--- a/Tools/clinic/clinic.py
+++ b/Tools/clinic/clinic.py
@@ -591,6 +591,12 @@ static {impl_return_type}
count_min = min(count_min, count)
count_max = max(count_max, count)
+ if count == 0:
+ add(""" case 0:
+ break;
+""")
+ continue
+
group_ids = {p.group for p in subset} # eliminate duplicates
d = {}
d['count'] = count