std.bounded_array: support inserting a new value at the end (#10340)

Since `BoundedArray.insert` internally reserves space for the element
to be inserted, it can support inserting at the position that is
the current length of the array. Change the check for the insertion position
to allow this.

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/std/bounded_array.zig b/lib/std/bounded_array.zig
index 51a4488387..bc5f196087 100644
--- a/lib/std/bounded_array.zig
+++ b/lib/std/bounded_array.zig
@@ -121,7 +121,7 @@ pub fn BoundedArray(comptime T: type, comptime capacity: usize) type {
         /// Insert `item` at index `i` by moving `slice[n .. slice.len]` to make room.
         /// This operation is O(N).
         pub fn insert(self: *Self, i: usize, item: T) !void {
-            if (i >= self.len) {
+            if (i > self.len) {
                 return error.IndexOutOfBounds;
             }
             _ = try self.addOne();
@@ -289,6 +289,10 @@ test "BoundedArray" {
     try testing.expectEqual(a.get(9), 3);
     try testing.expectEqual(a.get(10), 4);
 
+    try a.insert(11, 0xbb);
+    try testing.expectEqual(a.len, 12);
+    try testing.expectEqual(a.pop(), 0xbb);
+
     try a.appendSlice(&x);
     try testing.expectEqual(a.len, 11 + x.len);