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A simple solution is to leave them unevaluated. Change-Id: Ic7d1237452a387180ec12f23b3a4030ff64f061d Reviewed-on: https://dart-review.googlesource.com/c/89282 Commit-Queue: Kevin Millikin <kmillikin@google.com> Commit-Queue: Aske Simon Christensen <askesc@google.com> Auto-Submit: Kevin Millikin <kmillikin@google.com> Reviewed-by: Aske Simon Christensen <askesc@google.com>