[pull] master from boostorg:master #4
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…king change if you define your own status code domains.
…ypes for improved compatibility with third party software such as [ASIO](https://think-async.com/Asio/).
…_outcome` types whose `EC` is a `status_code`. Erased status codes are move-only which makes the Result/Outcome type move-only, but they provide a cloning function, so this convenience function both clones the status code and propagates the spare storage so stack backtraces etc are also cloned. - Add type constraints to `success()` and `failure()` to disable them if they aren't available.
…gets an ICE from `gimplify_expr` in any `OUTCOME_CO_TRY` taking even a mildly complex expression, which obviously is a showstopper. The work around assigns the failure type to a stack temporary before `co_return`-ing that temporary. Thanks to RVO pre-17 and copy elision since, this should add no runtime overhead.
Merge branch 'develop'
- To Experimental.Outcome add `clone()` for `basic_result` and `basic_outcome` types whose `EC` is a `status_code`. Erased status codes are move-only which makes the Result/Outcome type move-only, but they provide a cloning function, so this convenience function both clones the status code and propagates the spare storage so stack backtraces etc are also cloned. - Add type constraints to `success()` and `failure()` to disable them if they aren't available.
Work around a bug in GCC's C++ Coroutines implementation whereby one gets an ICE from `gimplify_expr` in any `OUTCOME_CO_TRY` taking even a mildly complex expression, which obviously is a showstopper. The work around assigns the failure type to a stack temporary before `co_return`-ing that temporary. Thanks to RVO pre-17 and copy elision since, this should add no runtime overhead.
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