Compiler debug print shows up in output

[solson]

See https://is.gd/FO2qVB.

Code:

fn foo<T>(_t: T) where for<'a> &'a T: for<'b> std::ops::Mul<&'b T, Output=T> {}

Compile output:

Span { lo: BytePos(38), hi: BytePos(76), expn_id: ExpnId(4294967295) }
error: nested quantification of lifetimes [E0316]
 --> <anon>:1:39
  |>
1 |> fn foo<T>(_t: T) where for<'a> &'a T: for<'b> std::ops::Mul<&'b T, Output=T> {}
  |>                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

Note the Span { ... }.