Make Arrays mutable types under separation checking #24649
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In capture checking, a type mismatch might happen for a synthesized tree (say from implicit search). It can be helpful to show this tree. Before capture checking a helpful message is less likely since we don't synthesize implicit trees that then don't match under the standard typing rules.
odersky changed the title odersky changed the title Fields are only allowed in stateful classes unless marked with @untrackedCaptures.
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Also: enforce that mutable fields can only be declared in
Statefulclasses, unless they are annotated withuntrackedCaptures.