fix code coverage

flake8_async/visitors/visitor123.py

@@ -87,9 +87,9 @@ def visit_Assign(self, node: ast.Assign | ast.AnnAssign):
             return
         targets = (node.target,) if isinstance(node, ast.AnnAssign) else node.targets
         if self._is_child_exception(node.value):
-            for target in targets:
-                if isinstance(target, ast.Name):
-                    self.child_exception_names.add(target.id)
+            # not normally possible to assign single exception to multiple targets
+            if len(targets) == 1 and isinstance(targets[0], ast.Name):
+                self.child_exception_names.add(targets[0].id)
         elif self._is_exception_list(node.value):
             if len(targets) == 1 and isinstance(targets[0], ast.Name):
                 self.child_exception_list_names.add(targets[0].id)

tests/eval_files/async123.py

@@ -114,3 +114,41 @@ def any_fun(arg: Exception) -> Exception:
     x: Any = object()
     x.y = e
     raise x.y.exceptions[0]
+
+# coverage
+try:
+    ...
+except ExceptionGroup:
+    ...
+
+# not implemented
+try:
+    ...
+except ExceptionGroup as e:
+    (a, *b), (c, *d) = e.split(bool)
+    if condition():
+        raise a
+    if condition():
+        raise b[0]
+    if condition():
+        raise c
+    if condition():
+        raise d[0]
+
+# coverage (skip irrelevant assignments)
+x = 0
+
+# coverage (ignore multiple targets when assign target is child exception)
+try:
+    ...
+except ExceptionGroup as e:
+    exc = e.exceptions[0]
+    b, c = exc
+    if condition():
+        raise b  # not handled, and probably shouldn't raise
+    else:
+        raise c  # same
+
+# coverage (skip irrelevant loop)
+for x in range(5):
+    ...