Johnni Winther
4b2cf0744d
This add a common sealed superclass TypeDeclarationType for ExtensionType and InterfaceType and uses it to add a common asInstanceOf method to ClassHierarchy. Change-Id: I7294e41069b063305c3bd4e384ff90614a3936a6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/331981 Reviewed-by: Chloe Stefantsova <cstefantsova@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Ömer Ağacan <omersa@google.com>