bugfix: fail gracefully when parens are uneven

1 files changed, 4 insertions, 0 deletions

diff --git a/neb/exceptions.py b/neb/exceptions.py
index 8bbe000..cc0f915 100644
--- a/neb/exceptions.py
+++ b/neb/exceptions.py
@@ -11,3 +11,7 @@ class InterpretPanic(NebPanic):
 class LexError(NebPanic):
     def __init__(self, message, line):
         super().__init__(f"line {line}: {message}")
+
+class ParseError(NebPanic):
+    def __init__(self, message, line):
+        super().__init__(f"line {line}: {message}")