Python: Add false positive test example for issue #2652.

python/ql/test/query-tests/Variables/unused/UnusedLocalVariable.expected

@@ -1,3 +1,4 @@
+| type_annotation_fp.py:5:5:5:7 | foo | The value assigned to local variable 'foo' is never used. |
 | variables_test.py:29:5:29:5 | x | The value assigned to local variable 'x' is never used. |
 | variables_test.py:89:5:89:5 | a | The value assigned to local variable 'a' is never used. |
 | variables_test.py:89:7:89:7 | b | The value assigned to local variable 'b' is never used. |

python/ql/test/query-tests/Variables/unused/type_annotation_fp.py

@@ -0,0 +1,11 @@
+# FP Type annotation counts as redefinition
+# See https://github.com/Semmle/ql/issues/2652
+
+def type_annotation(x):
+    foo = 5
+    if x:
+        foo : int
+        do_stuff_with(foo)
+    else:
+        foo : float
+        do_other_stuff_with(foo)