error: `pub` visibility breaks the seal as allows to use it outside its crate.
       Consider tightening the visibility (e.g. `pub(crate)`) if you actually need sealing.
 --> tests/fail/04-no-full-pub.rs:8:26
  |
8 |                 #[sealed(pub)]
  |                          ^^^

error[E0433]: failed to resolve: could not find `__seal_t` in `nesting`
  --> tests/fail/04-no-full-pub.rs:17:1
   |
17 | #[sealed]
   | ^^^^^^^^^ could not find `__seal_t` in `nesting`
   |
   = note: this error originates in the attribute macro `sealed` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0405]: cannot find trait `T` in module `lets::attempt::some::nesting`
  --> tests/fail/04-no-full-pub.rs:18:36
   |
18 | impl lets::attempt::some::nesting::T for A {}
   |                                    ^ not found in `lets::attempt::some::nesting`