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-rw-r--r--lib/spack/llnl/util/lang.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/llnl/util/lang.py b/lib/spack/llnl/util/lang.py
index 03783265dd..21eb9ee3ba 100644
--- a/lib/spack/llnl/util/lang.py
+++ b/lib/spack/llnl/util/lang.py
@@ -324,7 +324,7 @@ def check_kwargs(kwargs, fun):
if kwargs:
raise TypeError(
"'%s' is an invalid keyword argument for function %s()."
- % (next(kwargs.iterkeys()), fun.__name__))
+ % (next(iter(kwargs)), fun.__name__))
def match_predicate(*args):