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-rw-r--r--miasm2/core/asmbloc.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/miasm2/core/asmbloc.py b/miasm2/core/asmbloc.py
index 52d5c974..e44f27ed 100644
--- a/miasm2/core/asmbloc.py
+++ b/miasm2/core/asmbloc.py
@@ -78,6 +78,9 @@ class asm_constraint(object):
     c_bad = "c_bad"
 
     def __init__(self, label, c_t=c_to):
+        # Sanity check
+        assert isinstance(label, asm_label)
+
         self.label = label
         self.c_t = c_t