bors b289bb7fdf Auto merge of #87488 - kornelski:track-remove, r=dtolnay
Track caller of Vec::remove()

`vec.remove(invalid)` doesn't print a helpful source position:

> thread 'main' panicked at 'removal index (is 99) should be < len (is 1)', **library/alloc/src/vec/mod.rs:1379:13**
2021-07-31 03:00:20 +00:00
..