Deconstructing an HIR field type would fail in the case where there where the field type had no generic parameters, in that it would not be rewritten to include the new hypothetical lifetimes. Now the type is deconstructed correctly by providing an empty generic type parameter list, which allows the hir_args to have the correct value and allows adt_ty_rw to run and generate a rewrite for the ADT
Deconstructing an HIR field type would fail in the case where there where the field type had no generic parameters, in that it would not be rewritten to include the new hypothetical lifetimes. Now the type is deconstructed correctly by providing an empty generic type parameter list, which allows the hir_args to have the correct value and allows
adt_ty_rwto run and generate a rewrite for the ADT