Close #15386: There was a loophole that meant importlib.machinery and imp would sometimes reference an uninitialised copy of importlib._bootstrap

Lib/test/regrtest.py

@@ -165,6 +165,9 @@ example, to run all the tests except for the gui tests, give the
 option '-uall,-gui'.
 """
 
+# We import importlib *ASAP* in order to test #15386
+import importlib
+
 import builtins
 import faulthandler
 import getopt