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Karoy LorenteyandMishal Shah a88b55196d Bump Swift version to 6.4 (#87511)
`compiler(>=)` is the simplest/best way to write code that needs to only
be built on a particular toolchain version. For that to work, we cannot
have the `main` branch report itself as the same version as
`release/6.3`; accordingly, bump the compiler version number to 6.4.

(The Swift Standard Library already reports itself as 6.4. If the `main`
branch ends up shipping under some other Swift version, then we can
simply update this as needed, like we did with 5.11 → 6.0.)

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Co-authored-by: Mishal Shah <shahmishal@users.noreply.github.com>
2026-03-02 09:16:14 -08:00
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