Add debug prints in test_import.

Author: serhiy-storchaka

Lib/test/test_import/__init__.py

@@ -1254,6 +1254,13 @@ class Spec2:
 
     def test_filter_syntax_warnings_by_module(self):
         filename = findfile('test_warnings/data/syntax_warnings.py')
+        print()
+        print(filename)
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore')
+            import test.test_warnings.data.syntax_warnings
+        filename = test.test_warnings.data.syntax_warnings.__file__
+        print(filename)
         module_re = r'test\.test_warnings\.data\.syntax_warnings\z'
         unload('test.test_warnings.data.syntax_warnings')
         with (os_helper.temp_dir() as tmpdir,