The `t`/`c` modules are gone, so their C type aliases (CInt*, CUnsigned*, CSizeT, CBool, CVoid, CFloat, CDouble, CChar, t.State, t.DefineT, t.VolatileT, the c.CIf family, @c.CReturn) are no longer recognised or reported anywhere: sign inference, enum widths, stub generation/reading, expression lookups and the LSP type-alias check. `import t` / `import c` no longer gets a special message.