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-rw-r--r--internal/proc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal/proc.h b/internal/proc.h
index c75f15b283..c6a9e38bfa 100644
--- a/internal/proc.h
+++ b/internal/proc.h
@@ -23,6 +23,7 @@ VALUE rb_block_to_s(VALUE self, const struct rb_block *block, const char *additi
VALUE rb_callable_receiver(VALUE);
VALUE rb_func_proc_new(rb_block_call_func_t func, VALUE val);
+VALUE rb_func_proc_dup(VALUE src_obj);
VALUE rb_func_lambda_new(rb_block_call_func_t func, VALUE val, int min_argc, int max_argc);
VALUE rb_iseq_location(const struct rb_iseq_struct *iseq);
VALUE rb_sym_to_proc(VALUE sym);