tests: Add some more tests to improve coverage of py/parse.c.

tests/basics/syntaxerror.py

@@ -29,6 +29,10 @@ test_syntax(" a\n")
 # malformed integer literal (parser error)
 test_syntax("123z")
 
+# input doesn't match the grammar (parser error)
+test_syntax('1 or 2 or')
+test_syntax('{1:')
+
 # can't assign to literals
 test_syntax("1 = 2")
 test_syntax("'' = 1")