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-rw-r--r--calc-example/calc.syntax2
1 files changed, 1 insertions, 1 deletions
diff --git a/calc-example/calc.syntax b/calc-example/calc.syntax
index ef7a9f4..286019b 100644
--- a/calc-example/calc.syntax
+++ b/calc-example/calc.syntax
@@ -2,7 +2,7 @@ _WHITESPACE = " " | "\t" | " ";
_ = {_WHITESPACE};
-DIGIT = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9";
+DIGIT = <"0", "9">;
ADD = _, ("+"), _;
SUB = _, ("-" | "−"), _;