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These arise when the constant evaluator partially evaluates collections containing spreads or control-flow constructs with unevaluated subexpressions. They are removed by the final constant evaluation. Change-Id: Icdd155c4805cbcefe6aa4b45c2f85ec258e7bd36 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/95760 Commit-Queue: Aske Simon Christensen <askesc@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>