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-rw-r--r--third_party/nix/src/libexpr/parser.y2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/parser.y b/third_party/nix/src/libexpr/parser.y
index b272e4b03457..56674ee7ede5 100644
--- a/third_party/nix/src/libexpr/parser.y
+++ b/third_party/nix/src/libexpr/parser.y
@@ -1,7 +1,7 @@
 %glr-parser
-%pure-parser
 %locations
 %define parse.error verbose
+%define api.pure true
 %defines
 /* %no-lines */
 %parse-param { void * scanner }