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Based on the dart-lang/co19#2384 (comment) and #54097 (comment), please, improve analyzer error messafe in case of
extension type V<T extends V<T>>(T id) {}
The current message
COMPILE_TIME_ERROR.TYPE_PARAMETER_SUPERTYPE_OF_ITS_BOUND
'T' can't be a supertype of its upper bound.
is not much helpfull in this case
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