There is no lowering for these members today, so this moves a runtime
error to a static error. We may choose to add support when we can
add 'static' extension members that use the on-type for their
invocation, instead of the extension name.
Change-Id: I6e054cc4445292dd952dfd7601d10d871eae187d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/303060
Reviewed-by: Joshua Litt <joshualitt@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Srujan Gaddam
c98ec26c91