I guess this is the first opcode I've used that isn't available in all Pythons.

1 files changed, 7 insertions, 1 deletions

diff --git a/coverage/parser.py b/coverage/parser.py
index 9bce98a..25e474c 100644
--- a/coverage/parser.py
+++ b/coverage/parser.py
@@ -248,7 +248,13 @@ def _opcode(name):
 
 def _opcode_set(*names):
     """Return a set of opcodes by the names in `names`."""
-    return set([_opcode(name) for name in names])
+    s = set()
+    for name in names:
+        try:
+            s.add(_opcode(name))
+        except KeyError:
+            pass
+    return s
 
 # Opcodes that leave the code object.
 OPS_CODE_END = _opcode_set('RETURN_VALUE')