Revert "Allow return in tailrec position" #14067 #14736
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Kordyjan
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This was referenced Mar 21, 2022
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This means that the change is breaking binary compatibility
If I understand this correctly, the change is breaking tasty-compatibility (a .tasty produced by the new compiler would fail to compile to .class using the old compiler, because the old compiler TailRec phase would emit an error), but not binary-compatibility (a .class produced by the new compiler can be on the runtime classpath of a project compiled with the old compiler).
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This reverts #14067.
That PR allowed code that was using explicit returns in tailrec positions. This was rejected by all compilers older than 3.1.2-RC1. If a tailrec function with explicit returns was defined inside of an inline function, compilers up to version 3.1.1 wouldn't be able to perform the inlining. This means that the change is breaking binary compatibility between two patch releases in the 3.1 versioning line.
This pr needs to be backported to
release-3.1.2branch, then 3.1.2-RC3 needs to be released.We can re-merge #14067 before releasing the next minor version (3.2).