sealed 0.6.0

Macro for sealing traits and structures
Documentation 
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error: unknown `erased` attribute argument
 --> tests/fail/06-wrong-argument.rs:3:10
  |
3 | #[sealed(erased)]
  |          ^^^^^^

error[E0433]: failed to resolve: use of undeclared crate or module `__seal_t`
 --> tests/fail/06-wrong-argument.rs:8:1
  |
8 | #[sealed]
  | ^^^^^^^^^ use of undeclared crate or module `__seal_t`
  |
  = 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 this scope
 --> tests/fail/06-wrong-argument.rs:9:6
  |
9 | impl T for A {}
  |      ^ not found in this scope