rustc-ap-rustc_span 727.0.0

Automatically published version of the package `rustc_span` in the rust-lang/rust repository from commit 9a27044f42ace9eb652781b53f598e25d4e7e918 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
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Source positions and related helper functions. Important concepts in this module include: - the *span*, represented by [`SpanData`] and related types; - source code as represented by a [`SourceMap`]; and - interned strings, represented by [`Symbol`]s, with some common symbols available statically in the [`sym`] module. Unlike most compilers, the span contains not only the position in the source code, but also various other metadata, such as the edition and macro hygiene. This metadata is stored in [`SyntaxContext`] and [`ExpnData`]. ## Note This API is completely unstable and subject to change.