1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Lexer.mll b/lib/Lexer.mll
index c33acae..98d1d6b 100644
--- a/lib/Lexer.mll
+++ b/lib/Lexer.mll
@@ -21,6 +21,7 @@ rule lex =
   | "," { COMMA }
   | "." { DOT }
   | "=>" { FATARROW }
+  | "_" { UNDERSCORE }
   | "at" { AT }
   | "fst" { FST }
   | "snd" { SND }