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Iterable has been moved to collections.abc
diff --git a/testsuite/driver/testlib.py b/testsuite/driver/testlib.py
index e899d61b..2f967666 100644
--- a/testsuite/driver/testlib.py
+++ b/testsuite/driver/testlib.py
@@ -15,7 +15,7 @@ import glob
import sys
from math import ceil, trunc
from pathlib import Path, PurePath
-import collections
+import collections.abc
import subprocess
from testglobals import config, ghc_env, default_testopts, brokens, t, \
@@ -809,7 +809,7 @@ def join_normalisers(*a):
Taken from http://stackoverflow.com/a/2158532/946226
"""
for el in l:
- if (isinstance(el, collections.Iterable)
+ if (isinstance(el, collections.abc.Iterable)
and not isinstance(el, (bytes, str))):
for sub in flatten(el):
yield sub
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