Add exit code to ControlFlow::Exit (#2100)
* Add exit code to control flow and impl on linux * Fix examples to have an exit code * Fix doc examples to use an exit code * Improve documentation wording on the exit code * Add exit code example * Add exit code on windows * Change i32 as exit code to u8 This avoids nasty surprises with negative numbers on some unix-alikes due to two's complement. * Fix android usages of ControlFlow::Exit * Fix ios usages of ControlFlow::Exit * Fix web usages of ControlFlow::Exit * Add macos exit code * Add changelog note * Document exit code on display server disconnection * Revert "Change i32 as exit code to u8" This reverts commit f88fba0253b45de6a2ac0c3cbcf01f50503c9396. * Change Exit to ExitWithCode and make an Exit const * Revert "Add exit code example" This reverts commit fbd3d03de9c2d7516c7a63da489c99f498b710df. * Revert "Fix doc examples to use an exit code" This reverts commit daabcdf9ef9e16acad715c094ae442529e39fcbc. * Revert "Fix examples to have an exit code" This reverts commit 0df486896b8d106acf65ba83c45cc88d60d228e1. * Fix unix-alike to use ExitWithCode instead of Exit * Fix windows to use ExitWithCode rather than Exit * Silence warning about non-uppercase Exit const * Refactor exit code handling * Fix macos Exit usage and recover original semantic * Fix ios to use ExitWithCode instead of Exit * Update documentation to reflect ExitWithCode * Fix web to use ExitWithCode when needed, not Exit * Fix android to use ExitWithCode, not Exit * Apply documenation nits * Apply even more documentation nits * Move change in CHANGELOG.md under "Unreleased" * Try to use OS error code as exit code on wayland
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# Unreleased
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- **Breaking:** Rename the `Exit` variant of `ControlFlow` to `ExitWithCode`, which holds a value to control the exit code after running. Add an `Exit` constant which aliases to `ExitWithCode(0)` instead to avoid major breakage. This shouldn't affect most existing programs.
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# 0.26.1 (2022-01-05)
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- Fix linking to the `ColorSync` framework on macOS 10.7, and in newer Rust versions.
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