In current frontend.h, we have methods using the `d_uns64` type alias before the corresponding `typedef`. The common `struct Array` template is also used before being declared (a fwd declaration might suffice, but there isn't any either).
Comment #1 by moonlightsentinel — 2021-06-18T11:22:23Z
Most of these issues will be resolved https://github.com/dlang/dmd/pull/12678.
Type aliases in template declarations re more complicated because dtoh will need to resolve the alias from the TypeIdentifier
Comment #2 by robert.schadek — 2024-12-13T19:13:52Z