From bfba3fa9f79e5681c1037cf361da57cff9d62279 Mon Sep 17 00:00:00 2001
From: eileencodes <eileencodes@gmail.com>
Date: Wed, 10 Apr 2024 13:52:47 -0400
Subject: [PATCH] Fix missing type for `rb_debug_rstring_null_ptr`

I don't really understand how this type went missing since it's on the
upstream version. Maybe a bad rebase/merge? Either way this fixes the
following compilation error.

```
string.c:437:1: warning: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
rb_debug_rstring_null_ptr(const char *func)
^
int
string.c:437:1: error: conflicting types for 'rb_debug_rstring_null_ptr'
./include/ruby/internal/core/rstring.h:364:6: note: previous declaration is here
void rb_debug_rstring_null_ptr(const char *func);
     ^
```
---
 string.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/string.c b/string.c
index 9732a8955649ea..6f99600008b26b 100644
--- a/string.c
+++ b/string.c
@@ -434,6 +434,7 @@ rb_str_make_embedded(VALUE str)
     TERM_FILL(RSTRING(str)->as.embed.ary + len, TERM_LEN(str));
 }
 
+void
 rb_debug_rstring_null_ptr(const char *func)
 {
     fprintf(stderr, "%s is returning NULL!! "