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-rw-r--r--pygments/lexers/ml.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexers/ml.py b/pygments/lexers/ml.py
index f80d5bfa..0bff9816 100644
--- a/pygments/lexers/ml.py
+++ b/pygments/lexers/ml.py
@@ -43,7 +43,7 @@ class SMLLexer(RegexLexer):
symbolicid_reserved = set((
# Core
- ':', '\|', '=', '=>', '->', '#',
+ ':', r'\|', '=', '=>', '->', '#',
# Modules
':>',
))