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`List.unmodifiable` and `Map.unmodifiable` is as badly typed as `List.from` and `Map.from`, but does not have a better-typed `.of` constructor. This adds such, to give a migration target when deprecating the badly typed constructors. The `Future.delayed` with no second argument is also unsafely typed, it fails if the type argument is not nullable. The `Future.pause` creates `Future<void>` instead. CoreLibraryReviewExempt: No new or platform specific behavior. Change-Id: Iba101b3dc62f412003abd501fa042aca0ce63116 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/499280 Commit-Queue: Lasse Nielsen <lrn@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com> Reviewed-by: Nate Bosch <nbosch@google.com>
This directory contains tests of the language and core library implementations. For more information, see https://github.com/dart-lang/sdk/tree/main/docs/Testing.md.