40 columns                              |
>>>
extension SomeExtension on SomeLongClass {}
<<<
extension SomeExtension
    on SomeLongClass {}
>>>
extension Extension<VeryLongTypeParameterName> on C {}
<<<
extension Extension<
    VeryLongTypeParameterName> on C {}
>>>
extension Extension<VeryLongTypeParameterName> on BaseClass {}
<<<
extension Extension<
        VeryLongTypeParameterName>
    on BaseClass {}
>>>
extension Extension on C<VeryLongTypeArgumentName> {}
<<<
extension Extension
    on C<VeryLongTypeArgumentName> {}
>>>
extension Extension on BaseClass<VeryLongTypeArgumentName> {}
<<<
extension Extension on BaseClass<
    VeryLongTypeArgumentName> {}
>>>
extension Extension on VeryLongBaseClass<VeryLongTypeArgumentName> {}
<<<
extension Extension
    on VeryLongBaseClass<
        VeryLongTypeArgumentName> {}