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`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.) --------- Co-authored-by: Mishal Shah <shahmishal@users.noreply.github.com>