Rollup of 5 pull requests #72503
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Rollup of 5 pull requests #72503
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Replace obligation construction with deref_steps() 1. Use `probe()` to avoid unwanted binding committing during `deref_steps()`. 2. Fixes rust-lang#59819 again by using `deref_steps()`, make the code cleaner. And if we want to suggest multiple dereferences (like: `consider dereferencing the borrow: "****a"`) in the future, this change will make it easier to achieve.
add warning sign to UB examples Just to make it less likely that people miss the fact that these are examples for how to *not* do it.
Impl Ord for proc_macro::LineColumn
```rust
impl Ord for LineColumn {...}
impl PartialOrd for LineColumn {...}
```
for https://doc.rust-lang.org/nightly/proc_macro/struct.LineColumn.html.
The ordering is the natural one you would get by writing one line after another, where we compare line first, then compare columns within the same line.
Add some regression tests Closes rust-lang#69415 Closes rust-lang#72455 r? @matthewjasper
Correct small typo: 'not' -> 'note'
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r? @ghost