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-rw-r--r--pysnmp/smi/mibs/ASN1-REFINEMENT.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/pysnmp/smi/mibs/ASN1-REFINEMENT.py b/pysnmp/smi/mibs/ASN1-REFINEMENT.py
index 1f5bce27..4cdea375 100644
--- a/pysnmp/smi/mibs/ASN1-REFINEMENT.py
+++ b/pysnmp/smi/mibs/ASN1-REFINEMENT.py
@@ -4,8 +4,16 @@
# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pysnmp/license.html
#
+# This module supplies built-in ASN.1 types to the MIBs importing it.
+#
from pyasn1.type import constraint
+if 'mibBuilder' not in globals():
+ import sys
+
+ sys.stderr.write(__doc__)
+ sys.exit(1)
+
mibBuilder.exportSymbols(
'ASN1-REFINEMENT',
ConstraintsUnion=constraint.ConstraintsUnion,