Point out the known type when field doesn't satisfy bound

For file

```rust
use std::path::Path;

fn f(p: Path) { }
```

provide the following error

```nocode
error[E0277]: the trait bound `[u8]: std::marker::Sized` is not satisfied in `std::path::Path`
 --> file.rs:3:6
  |
3 | fn f(p: Path) { }
  |      ^ within `std::path::Path`, the trait `std::marker::Sized` is not implemented for `[u8]`
  |
  = note: `[u8]` does not have a constant size known at compile-time
  = note: required because it appears within the type `std::path::Path`
  = note: all local variables must have a statically known size
```

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