Make magic imply error handling, cc, source future - #26963
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New language feature: experimental.errorHandling. It needs -Yexplicit-nulls to be also set This enables the following: - Add maybe types T? and T ? E. - Add amybe prompt and postfix e? operator - Implement subtype rules - Implement erasure rules - Special pattern-matching rules for Ok and Err extractors
Comes with the following bug fixes: 1. Maybe arguments should not be boxed. 2. Capture sets of module vals need to be interpolated 3. When reporting overriding errors under -explain, use isSubTypeWhenFrozen 4. Interpolate self types of modules downwards 5. Make Tuple a Pure trait (fails i13968-maybe.scala otherwise) 6. Make newSyntax a def so that it can see language imports Also: Move spec string support into new package magic.compiletime
This could be the result of inlining, in which case the warning would be annoying. Also, the warning message is about divergence not about redundant tests.
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Based on #26956.