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-rw-r--r--lib/spack/spack/solver/asp.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/spack/spack/solver/asp.py b/lib/spack/spack/solver/asp.py
index 9e37ab5cf8..55e18e88e8 100644
--- a/lib/spack/spack/solver/asp.py
+++ b/lib/spack/spack/solver/asp.py
@@ -1667,7 +1667,8 @@ class SpecBuilder(object):
# print out unknown actions so we can display them for debugging
if not action:
- print("%s(%s)" % (name, ", ".join(str(a) for a in args)))
+ msg = "%s(%s)" % (name, ", ".join(str(a) for a in args))
+ tty.debug(msg)
continue
assert action and callable(action)