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-rw-r--r--src/backend/bootstrap/bootscanner.l1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/backend/bootstrap/bootscanner.l b/src/backend/bootstrap/bootscanner.l
index fba020008fe..f4230d93b18 100644
--- a/src/backend/bootstrap/bootscanner.l
+++ b/src/backend/bootstrap/bootscanner.l
@@ -55,6 +55,7 @@ static int yyline = 1; /* line number for error reporting */
%option noinput
%option nounput
%option noyywrap
+%option warn
%option prefix="boot_yy"