Result's panics have #[track_caller].

Author: anp

src/libcore/result.rs

@@ -957,6 +957,7 @@ impl<T, E: fmt::Debug> Result<T, E> {
     /// x.unwrap(); // panics with `emergency failure`
     /// ```
     #[inline]
+    #[track_caller]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn unwrap(self) -> T {
         match self {
@@ -984,6 +985,7 @@ impl<T, E: fmt::Debug> Result<T, E> {
     /// x.expect("Testing expect"); // panics with `Testing expect: emergency failure`
     /// ```
     #[inline]
+    #[track_caller]
     #[stable(feature = "result_expect", since = "1.4.0")]
     pub fn expect(self, msg: &str) -> T {
         match self {
@@ -1017,6 +1019,7 @@ impl<T: fmt::Debug, E> Result<T, E> {
     /// assert_eq!(x.unwrap_err(), "emergency failure");
     /// ```
     #[inline]
+    #[track_caller]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn unwrap_err(self) -> E {
         match self {
@@ -1044,6 +1047,7 @@ impl<T: fmt::Debug, E> Result<T, E> {
     /// x.expect_err("Testing expect_err"); // panics with `Testing expect_err: 10`
     /// ```
     #[inline]
+    #[track_caller]
     #[stable(feature = "result_expect_err", since = "1.17.0")]
     pub fn expect_err(self, msg: &str) -> E {
         match self {
@@ -1188,6 +1192,7 @@ impl<T, E> Result<Option<T>, E> {
 // This is a separate function to reduce the code size of the methods
 #[inline(never)]
 #[cold]
+#[track_caller]
 fn unwrap_failed(msg: &str, error: &dyn fmt::Debug) -> ! {
     panic!("{}: {:?}", msg, error)
 }

src/test/ui/rfc-2091-track-caller/std-panic-locations.rs

@@ -26,4 +26,12 @@ fn main() {
     let yep: Option<()> = Some(());
     assert_panicked(|| yep.unwrap_none());
     assert_panicked(|| yep.expect_none(""));
+
+    let oops: Result<(), ()> = Err(());
+    assert_panicked(|| oops.unwrap());
+    assert_panicked(|| oops.expect(""));
+
+    let fine: Result<(), ()> = Ok(());
+    assert_panicked(|| fine.unwrap_err());
+    assert_panicked(|| fine.expect_err(""));
 }