Disable deprecation warning by the default [Feature #16345]

And `-w` option turns it on.

1 files changed, 3 insertions, 1 deletions

diff --git a/error.c b/error.c
index 6a9aa2f2c3..9f8cdf8fe6 100644
--- a/error.c
+++ b/error.c
@@ -142,7 +142,9 @@ rb_syntax_error_append(VALUE exc, VALUE file, int line, int column,
     return exc;
 }
 
-static unsigned int warning_disabled_categories;
+static unsigned int warning_disabled_categories = (
+    1U << RB_WARN_CATEGORY_DEPRECATED |
+    0);
 
 static unsigned int
 rb_warning_category_mask(VALUE category)