Rename Location::file_with_nul to file_as_c_str

Author: Darksonn

library/core/src/panic/location.rs

@@ -39,7 +39,7 @@ use crate::ptr::NonNull;
 pub struct Location<'a> {
     // A raw pointer is used rather than a reference because the pointer is valid for one more byte
     // than the length stored in this pointer; the additional byte is the NUL-terminator used by
-    // `Location::file_with_nul`.
+    // `Location::file_as_c_str`.
     filename: NonNull<str>,
     line: u32,
     col: u32,
@@ -195,7 +195,7 @@ impl<'a> Location<'a> {
     #[must_use]
     #[unstable(feature = "file_with_nul", issue = "141727")]
     #[inline]
-    pub const fn file_with_nul(&self) -> &'a CStr {
+    pub const fn file_as_c_str(&self) -> &'a CStr {
         let filename = self.filename.as_ptr();
 
         // SAFETY: The filename is valid for `filename_len+1` bytes, so this addition can't

tests/ui/rfcs/rfc-2091-track-caller/file-is-nul-terminated.rs

@@ -5,12 +5,12 @@
 const fn assert_file_has_trailing_zero() {
     let caller = core::panic::Location::caller();
     let file_str = caller.file();
-    let file_with_nul = caller.file_with_nul();
-    if file_str.len() != file_with_nul.count_bytes() {
+    let file_cstr = caller.file_as_c_str();
+    if file_str.len() != file_cstr.count_bytes() {
         panic!("mismatched lengths");
     }
     let trailing_byte: core::ffi::c_char = unsafe {
-        *file_with_nul.as_ptr().offset(file_with_nul.count_bytes() as _)
+        *file_cstr.as_ptr().offset(file_cstr.count_bytes() as _)
     };
     if trailing_byte != 0 {
         panic!("trailing byte was nonzero")