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-rw-r--r--pygments/lexer.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexer.py b/pygments/lexer.py
index ab7fdf2f..2bf1d2c6 100644
--- a/pygments/lexer.py
+++ b/pygments/lexer.py
@@ -371,7 +371,7 @@ class RegexLexerMeta(LexerMeta):
(tdef[0], state, cls, err))
assert type(tdef[1]) is _TokenType or callable(tdef[1]), \
- 'token type must be simple type or callable, not %r' % tdef[1]
+ 'token type must be simple type or callable, not %r' % (tdef[1],)
if len(tdef) == 2:
new_state = None