[release/9.0] Switch SwiftSelf<T> position requirement to last
#108856
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This is added as the last parameter by the Swift compiler, so to support instance calls taking parameters this needs to come last.
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#108547 is not merged yet, but I expect to merge it soon once CI is sorted out. In the mean time I am just getting this all ready to merge as well in light of the snap tomorrow. |
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Backport of #108547 to release/9.0
/cc @jakobbotsch
Customer Impact
Interop with instance methods on Swift structs that have any parameters is impossible. Currently Mono and CoreCLR enforce the "self" parameter to be first, but the Swift compiler requires it to be last.
This results in incompatible signatures that makes interop not work in this scenario.
Note that there is still a known issue with Mono's handling; see #108855. We expect to fix this in servicing if it ends up impacting user scenarios.
Regression
Swift interop is new in .NET 9.
Testing
Tests with instance methods that have parameters are added as part of the PR.
Risk
Low. Swift interop is new in .NET 9.