096c4958bf
Stabilize proc_macro::Span::{start,end,line,column}.
This stabilizes part of https://github.com/rust-lang/rust/issues/54725
Specifically, the part related to getting the location of a span:
```rust
impl Span {
pub fn start(&self) -> Span; // Empty span at the start of this span
pub fn end(&self) -> Span; // Empty span at the end of this span
pub fn line(&self) -> usize; // Line where the span starts
pub fn column(&self) -> usize; // Column where the span starts
}
```
History of this part of the API:
Originally, `start` and `end` returned a `LineColumn` struct (containing the line and column).
This has been simplified/changed:
- No more `LineColumn`: `Span` now directly has `.line()` and `.column()` methods. This means we can easily add `.byte_offset()` or `.byte_range()` in the future if we want to.
- `Span::start()` and `Span::end()` are now the equivalent of rustc's internal `shrink_to_lo()` and `shrink_to_hi()`. This means you can do e.g. `span.end().column()`, removing the need for a `span.end_column()` or similar.
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