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-rw-r--r--third_party/nix/src/libexpr/parser.y5
1 files changed, 4 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/parser.y b/third_party/nix/src/libexpr/parser.y
index 56674ee7ed..9998721488 100644
--- a/third_party/nix/src/libexpr/parser.y
+++ b/third_party/nix/src/libexpr/parser.y
@@ -11,7 +11,10 @@
 %expect 1
 %expect-rr 1
 
-%code requires { #include "libexpr/parser.hh" }
+%code requires {
+#define YY_NO_INPUT 1 // disable unused yyinput features
+#include "libexpr/parser.hh"
+}
 
 %{