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-rw-r--r--pygments/lexers/iolang.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexers/iolang.py b/pygments/lexers/iolang.py
index bbc17faf..26f44e27 100644
--- a/pygments/lexers/iolang.py
+++ b/pygments/lexers/iolang.py
@@ -49,7 +49,7 @@ class IoLexer(RegexLexer):
# names
(r'(Object|list|List|Map|args|Sequence|Coroutine|File)\b',
Name.Builtin),
- ('[a-zA-Z_]\w*', Name),
+ (r'[a-zA-Z_]\w*', Name),
# numbers
(r'(\d+\.?\d*|\d*\.\d+)([eE][+-]?[0-9]+)?', Number.Float),
(r'\d+', Number.Integer)