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Span::file and Span::local_file suggest to use Rust 1.88 when using stable#536

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Span::file and Span::local_file suggest to use Rust 1.88 when using stable#536
peter-lyons-kehl wants to merge 1 commit intodtolnay:masterfrom
peter-lyons-kehl:fileand_local_file_rust_version

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@peter-lyons-kehl
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Thank you David for proc-macro2, serde and all the goodness.

You, and proc macro experts know that Span::local and Span::local_file stabilized in Rust only in 1.88.0, but proc-macro2 has those functions even with its current MSRV being lower.

May we save people's time and give them a hint that they may want 1.88.0+ for this, please.

Good to have met you at RustConf in Portland, OR a few years ago, and then again (in Albuquerque from memory). Take care & bless you.

@peter-lyons-kehl
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Tangentially related to #522.

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