Add #[track_caller] to String methods that assert inputs

Author: kornelski

library/alloc/src/string.rs

@@ -1463,6 +1463,7 @@ impl String {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[track_caller]
     pub fn truncate(&mut self, new_len: usize) {
         if new_len <= self.len() {
             assert!(self.is_char_boundary(new_len));
@@ -1518,6 +1519,7 @@ impl String {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[track_caller]
     #[rustc_confusables("delete", "take")]
     pub fn remove(&mut self, idx: usize) -> char {
         let ch = match self[idx..].chars().next() {
@@ -1712,6 +1714,7 @@ impl String {
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[inline]
+    #[track_caller]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_confusables("set")]
     pub fn insert(&mut self, idx: usize, ch: char) {
@@ -1768,6 +1771,7 @@ impl String {
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[inline]
+    #[track_caller]
     #[stable(feature = "insert_str", since = "1.16.0")]
     #[rustc_diagnostic_item = "string_insert_str"]
     pub fn insert_str(&mut self, idx: usize, string: &str) {
@@ -1961,6 +1965,7 @@ impl String {
     /// assert_eq!(s, "");
     /// ```
     #[stable(feature = "drain", since = "1.6.0")]
+    #[track_caller]
     pub fn drain<R>(&mut self, range: R) -> Drain<'_>
     where
         R: RangeBounds<usize>,
@@ -2060,6 +2065,7 @@ impl String {
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[stable(feature = "splice", since = "1.27.0")]
+    #[track_caller]
     pub fn replace_range<R>(&mut self, range: R, replace_with: &str)
     where
         R: RangeBounds<usize>,