Unhelpful "std::marker::Sized` is not satisfied" error

[alexcrichton]

Compiling this program:

fn main() {        
    let b = bar;   
    foo(&b);       
}                  

fn foo(_: &[i32]) {
}

yields

foo.rs:2:13: 2:16 error: unresolved name `bar` [E0425]
foo.rs:2     let b = bar;
                     ^~~
foo.rs:2:13: 2:16 help: run `rustc --explain E0425` to see a detailed explanation
foo.rs:2:9: 2:10 error: the trait bound `[i32]: std::marker::Sized` is not satisfied [E0277]
foo.rs:2     let b = bar;
                 ^
foo.rs:2:9: 2:10 help: run `rustc --explain E0277` to see a detailed explanation
foo.rs:2:9: 2:10 note: `[i32]` does not have a constant size known at compile-time
foo.rs:2:9: 2:10 note: all local variables must have a statically known size
error: aborting due to previous error

The first error, the unresolved name, is legitimate, but the next is just extra information that's not too helpful and is likely fixed once the previous error is fixed.

[alexcrichton]

cc @nrc

[nrc]

Interesting, we're probably checking that ty::Error: Sized, which is nonsense and shouldn't cause an error.

[eddyb]

@nrc On the contrary, TyError is the solution, and it's not getting used; this is a duplicate of #33575.

[Mark-Simulacrum]

Closing in favor of #33575.