845b5b2df1
This is in preparation for recognizing Fasta-specific nodes in the constant evaluator, and for using the Fasta diagnostics framework. Change-Id: I8535fbb68e622f1814a1d577c348d87e573b6b34 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96081 Reviewed-by: Kevin Millikin <kmillikin@google.com>