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* Throw a specific error on mixed compilation mode; let the incremental compiler ignore that error when trying to initialize (i.e. it doesn't initialize from it, but it doesn't show any warning either). * Allow some mixed mode stuff: Eventually the SDK should be in agnostic mode, so we should allow mixing agnostic with non-agnostic. Fixes #41493. Change-Id: Idb33fb31afe6bbba6d74134cb722ca825751898b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/143583 Commit-Queue: Jens Johansen <jensj@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>