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-rw-r--r--libcpp/include/cpplib.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 76c297acdcb..6c4225c8be7 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -248,7 +248,7 @@ struct GTY(()) cpp_token {
};
/* Say which field is in use. */
-extern enum cpp_token_fld_kind cpp_token_val_index (cpp_token *tok);
+extern enum cpp_token_fld_kind cpp_token_val_index (const cpp_token *tok);
/* A type wide enough to hold any multibyte source character.
cpplib's character constant interpreter requires an unsigned type.