Use a better variable name for w

ruby.c

@@ -296,12 +296,12 @@ show_usage_line(const struct ruby_opt_message *m,
 
 void
 ruby_show_usage_line(const char *name, const char *secondary, const char *description,
-                     int help, int highlight, unsigned int w, int columns)
+                     int help, int highlight, unsigned int width, int columns)
 {
     unsigned int namelen = (unsigned int)strlen(name);
     unsigned int secondlen = (secondary ? (unsigned int)strlen(secondary) : 0);
     show_usage_part(name, namelen, secondary, secondlen,
-                    description, help, highlight, w, columns);
+                    description, help, highlight, width, columns);
 }
 
 static void

yjit.h

@@ -43,7 +43,7 @@ void rb_yjit_iseq_free(void *payload);
 void rb_yjit_before_ractor_spawn(void);
 void rb_yjit_constant_ic_update(const rb_iseq_t *const iseq, IC ic, unsigned insn_idx);
 void rb_yjit_tracing_invalidate_all(void);
-void rb_yjit_show_usage(int help, int highlight, unsigned int w, int columns);
+void rb_yjit_show_usage(int help, int highlight, unsigned int width, int columns);
 
 #else
 // !USE_YJIT

yjit/src/options.rs

@@ -244,16 +244,17 @@ pub fn parse_option(str_ptr: *const std::os::raw::c_char) -> Option<()> {
     return Some(());
 }
 
-/// Print YJIT options for `ruby --help`.
+/// Print YJIT options for `ruby --help`. `width` is width of option parts, and
+/// `columns` is indent width of descriptions.
 #[no_mangle]
-pub extern "C" fn rb_yjit_show_usage(help: c_int, highlight: c_int, w: c_uint, columns: c_int) {
+pub extern "C" fn rb_yjit_show_usage(help: c_int, highlight: c_int, width: c_uint, columns: c_int) {
     for &(name, description) in YJIT_OPTIONS.iter() {
         extern "C" {
             fn ruby_show_usage_line(name: *const c_char, secondary: *const c_char, description: *const c_char,
-                                    help: c_int, highlight: c_int, w: c_uint, columns: c_int);
+                                    help: c_int, highlight: c_int, width: c_uint, columns: c_int);
         }
         let name = CString::new(name).unwrap();
         let description = CString::new(description).unwrap();
-        unsafe { ruby_show_usage_line(name.as_ptr(), null(), description.as_ptr(), help, highlight, w, columns) }
+        unsafe { ruby_show_usage_line(name.as_ptr(), null(), description.as_ptr(), help, highlight, width, columns) }
     }
 }