internal/ractor.h: Added

Currently it has only one function prototype.

internal/ractor.h

@@ -0,0 +1,6 @@
+#ifndef INTERNAL_RACTOR_H                                /*-*-C-*-vi:se ft=c:*/
+#define INTERNAL_RACTOR_H
+
+void rb_ractor_ensure_main_ractor(const char *msg);
+
+#endif /* INTERNAL_RACTOR_H */

ractor_core.h

@@ -185,8 +185,6 @@ void rb_ractor_atfork(rb_vm_t *vm, rb_thread_t *th);
 
 VALUE rb_ractor_ensure_shareable(VALUE obj, VALUE name);
 
-void rb_ractor_ensure_main_ractor(const char *msg);
-
 RUBY_SYMBOL_EXPORT_BEGIN
 bool rb_ractor_shareable_p_continue(VALUE obj);
 

re.c

@@ -20,8 +20,8 @@
 #include "internal/imemo.h"
 #include "internal/re.h"
 #include "internal/string.h"
+#include "internal/ractor.h"
 #include "internal/variable.h"
-#include "ractor_core.h"
 #include "regint.h"
 #include "ruby/encoding.h"
 #include "ruby/re.h"