Dylan DPC fa56e01b35
Rollup merge of #111571 - jhpratt:proc-macro-span, r=m-ou-se
Implement proposed API for `proc_macro_span`

As proposed in [#54725 (comment)](https://github.com/rust-lang/rust/issues/54725#issuecomment-1546918161). I have omitted the byte-level API as it's already available as [`Span::byte_range`](https://doc.rust-lang.org/nightly/proc_macro/struct.Span.html#method.byte_range).

`@rustbot` label +A-proc-macros

r? `@m-ou-se`
2023-06-28 18:28:46 +05:30
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