cf850ff4cc
`CatchVariable`s are supposed to be used as parameters of the `catch` block. In the CL they are emitted under an experimental flag. Part of https://github.com/dart-lang/sdk/issues/61572 Change-Id: I6a486a63680fb484de7607fdebab8ba9dd975f5b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/482783 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Chloe Stefantsova <cstefantsova@google.com>