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-rw-r--r--ext/continuation/continuation.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/continuation/continuation.c b/ext/continuation/continuation.c
index ae69b66cd8..71b52db539 100644
--- a/ext/continuation/continuation.c
+++ b/ext/continuation/continuation.c
@@ -1,8 +1,11 @@
+#include "ruby/ruby.h"
+
void ruby_Init_Continuation_body(void);
void
Init_continuation(void)
{
+ rb_warn("callcc is obsolete; use Fiber instead");
ruby_Init_Continuation_body();
}