Unexpected inference error

[TheJare]

An error in the source code causes the correct compile error, but rustc then emits an additional compile error in unrelated, completely correct code.

I tried this code:

fn main() {
for xx in 0..11 { print!("{}", xx as f64) };
kk = 666 // Error here triggers inference error in previous line
}

I expected to see this happen:

error[E0425]: cannot find value `kk` in this scope
 --> <anon>:3:5
  |
3 |     kk = 666
  |     ^^ did you mean `Ok`?

But in addition, this happened too:

error: non-scalar cast: `{integer}` as `f64`
 --> <anon>:2:36
  |
2 |     for xx in 0..11 { print!("{}", xx as f64) };
  |                                    ^^^^^^^^^

If the line containing the legitimate error is removed, the unrelated code compiles correctly as expected, and the additional, incorrect error will no longer show up.

[Mark-Simulacrum]

Closing in favor of #35772.