[6.2] Update spelling for representing lifetime dependencies to @_lifetime #82146
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Explanation: LifetimeDependence is a supported experimental feature for which we have to maintain source compatibility. During language evolution if we decide to update its semantics or syntax under
@lifetimeattribute, it can introduce significant confusion and maintenance problems to both early adopters and compiler developers.To mitigate this, this PR introduces an underscore, effectively making the annotation
@_lifetime, to provide a clear distinction and avoid potential conflicts during future development. Standard library will continue to use@lifetimein the near term.@_lifetimeis implemented as a suppressible language feature and@lifetimeis printed in the suppressed path since the oldest compilers we have to support with a new sdk have support for@lifetime. This will ensure when the standard library migrates to@_lifetimewe will continue to support older compilers.Issue: rdar://151901744
Scope: Affects early adopters of lifetime dependencies
Risk: Medium. Along with the source changes being large, this change can cause a warning with @Lifetime uses outside the stdlib.
Main PR: #82067
Reviewers: @atrick @tshortli
Testing: swift CI testing.