tests/basics: Add more tests for unwind jumps from within a try-finally.

These tests excercise cases that are fixed by the previous two commits.

tests/basics/try_finally_loops.py

@@ -41,3 +41,28 @@ for i in [1]:
         break
     finally:
         print('finally 4')
+
+# Test unwind-jump where there is nothing in the body of the try or finally.
+# This checks that the bytecode emitter allocates enough stack for the unwind.
+for i in [1]:
+    try:
+        break
+    finally:
+        pass
+
+# The following test checks that the globals dict is valid after a call to a
+# function that has an unwind jump.
+# There was a bug where an unwind jump would trash the globals dict upon return
+# from a function, because it used the Python-stack incorrectly.
+def f():
+    for i in [1]:
+        try:
+            break
+        finally:
+            pass
+def g():
+    global global_var
+    f()
+    print(global_var)
+global_var = 'global'
+g()