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-rw-r--r--src/libexpr/lexer.l1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 5db13a71699b..df30a5ed0713 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -91,6 +91,7 @@ else        { return ELSE; }
 assert      { return ASSERT; }
 with        { return WITH; }
 let         { return LET; }
+in          { return IN; }
 rec         { return REC; }
 inherit     { return INHERIT; }