Auto merge of #51033 - coryshrmn:master, r=dtolnay

stabilize RangeBounds collections_range #30877

The FCP for #30877 closed last month, with the decision to:
1. move from `collections::range::RangeArgument` to `ops::RangeBounds`, and
2. rename `start()` and `end()` to `start_bounds()` and `end_bounds()`.

Simon Sapin already moved it to `ops::RangeBounds` in #49163.

I renamed the functions, and removed the old `collections::range::RangeArgument` alias.

This is my first Rust PR, please let me know if I can improve anything. This passes all tests for me, except the `clippy` tool (which uses `RangeArgument::start()`).

I considered deprecating `start()` and `end()` instead of removing them, but the contribution guidelines indicate we can break `clippy` temporarily. I thought it was best to remove the functions, since we're worried about name collisions with `Range::start` and `end`.

Closes #30877.

src/liballoc/btree/map.rs

@@ -1834,7 +1834,7 @@ fn range_search<BorrowType, K, V, Q: ?Sized, R: RangeBounds<Q>>(
      Handle<NodeRef<BorrowType, K, V, marker::Leaf>, marker::Edge>)
         where Q: Ord, K: Borrow<Q>
 {
-    match (range.start(), range.end()) {
+    match (range.start_bound(), range.end_bound()) {
         (Excluded(s), Excluded(e)) if s==e =>
             panic!("range start and end are equal and excluded in BTreeMap"),
         (Included(s), Included(e)) |
@@ -1852,7 +1852,7 @@ fn range_search<BorrowType, K, V, Q: ?Sized, R: RangeBounds<Q>>(
     let mut diverged = false;
 
     loop {
-        let min_edge = match (min_found, range.start()) {
+        let min_edge = match (min_found, range.start_bound()) {
             (false, Included(key)) => match search::search_linear(&min_node, key) {
                 (i, true) => { min_found = true; i },
                 (i, false) => i,
@@ -1866,7 +1866,7 @@ fn range_search<BorrowType, K, V, Q: ?Sized, R: RangeBounds<Q>>(
             (true, Excluded(_)) => 0,
         };
 
-        let max_edge = match (max_found, range.end()) {
+        let max_edge = match (max_found, range.end_bound()) {
             (false, Included(key)) => match search::search_linear(&max_node, key) {
                 (i, true) => { max_found = true; i+1 },
                 (i, false) => i,

src/liballoc/string.rs

@@ -1493,12 +1493,12 @@ impl String {
         // Because the range removal happens in Drop, if the Drain iterator is leaked,
         // the removal will not happen.
         let len = self.len();
-        let start = match range.start() {
+        let start = match range.start_bound() {
             Included(&n) => n,
             Excluded(&n) => n + 1,
             Unbounded => 0,
         };
-        let end = match range.end() {
+        let end = match range.end_bound() {
             Included(&n) => n + 1,
             Excluded(&n) => n,
             Unbounded => len,
@@ -1551,12 +1551,12 @@ impl String {
         // Replace_range does not have the memory safety issues of a vector Splice.
         // of the vector version. The data is just plain bytes.
 
-        match range.start() {
+        match range.start_bound() {
              Included(&n) => assert!(self.is_char_boundary(n)),
              Excluded(&n) => assert!(self.is_char_boundary(n + 1)),
              Unbounded => {},
         };
-        match range.end() {
+        match range.end_bound() {
              Included(&n) => assert!(self.is_char_boundary(n + 1)),
              Excluded(&n) => assert!(self.is_char_boundary(n)),
              Unbounded => {},

src/liballoc/vec.rs

@@ -1166,12 +1166,12 @@ impl<T> Vec<T> {
         // the hole, and the vector length is restored to the new length.
         //
         let len = self.len();
-        let start = match range.start() {
+        let start = match range.start_bound() {
             Included(&n) => n,
             Excluded(&n) => n + 1,
             Unbounded    => 0,
         };
-        let end = match range.end() {
+        let end = match range.end_bound() {
             Included(&n) => n + 1,
             Excluded(&n) => n,
             Unbounded    => len,

src/liballoc/vec_deque.rs

@@ -980,12 +980,12 @@ impl<T> VecDeque<T> {
         // and the head/tail values will be restored correctly.
         //
         let len = self.len();
-        let start = match range.start() {
+        let start = match range.start_bound() {
             Included(&n) => n,
             Excluded(&n) => n + 1,
             Unbounded    => 0,
         };
-        let end = match range.end() {
+        let end = match range.end_bound() {
             Included(&n) => n + 1,
             Excluded(&n) => n,
             Unbounded    => len,