add track_caller attribute to map_err and ok_or/_else

library/core/src/option.rs

@@ -1305,6 +1305,7 @@ impl<T> Option<T> {
     /// assert_eq!(x.ok_or(0), Err(0));
     /// ```
     #[inline]
+    #[track_caller]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn ok_or<E>(self, err: E) -> Result<T, E> {
         match self {
@@ -1330,6 +1331,7 @@ impl<T> Option<T> {
     /// assert_eq!(x.ok_or_else(|| 0), Err(0));
     /// ```
     #[inline]
+    #[track_caller]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn ok_or_else<E, F>(self, err: F) -> Result<T, E>
     where

library/core/src/result.rs

@@ -907,6 +907,7 @@ impl<T, E> Result<T, E> {
     /// assert_eq!(x.map_err(stringify), Err("error code: 13".to_string()));
     /// ```
     #[inline]
+    #[track_caller]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn map_err<F, O: FnOnce(E) -> F>(self, op: O) -> Result<T, F> {
         match self {