Bad error span: "overflow evaluating whether `&_` is well-formed"

Code

Check out https://github.com/generic-daw/generic-daw/commit/bdb130716b7a2c95f2c4759ac01dad2c0e463716, and apply the following patch:

diff --git a/generic_daw_core/src/sample.rs b/generic_daw_core/src/sample.rs
index 32bb75a9..223b0fec 100644
--- a/generic_daw_core/src/sample.rs
+++ b/generic_daw_core/src/sample.rs
@@ -60,7 +60,7 @@ impl Sample {
 				.copy_to_vec_interleaved(&mut packet_buf);
 
 			if channels == 1 {
-				samples.extend(packet_buf.iter().skip(delay).map(|&x| [x, x]));
+				samples.extend(packet_buf.iter().skip(delay).map(|x| [x, x]));
 			} else if channels != 0 {
 				samples.extend(
 					packet_buf

Current output

error[E0275]: overflow evaluating whether `&_` is well-formed
  --> generic_daw_core/src/sample.rs:49:21
   |
49 |         let mut samples = Vec::with_capacity(num_frames);
   |                           ^^^

For more information about this error, try `rustc --explain E0275`.
error: could not compile `generic_daw_core` (lib) due to 1 previous error

Desired output

Rationale and extra context

The span points quite far away from the actual problem, and the message itself doesn't help much in figuring out what's going on. It would be nice to either point to where the actual recursion is happening, or show more of the problematic type than &_.

Other cases

Rust Version

rustc 1.98.0-nightly (f20a92ec0 2026-06-07)
binary: rustc
commit-hash: f20a92ec01483dc5c58e90e246f266bdad822d86
commit-date: 2026-06-07
host: x86_64-unknown-linux-gnu
release: 1.98.0-nightly
LLVM version: 22.1.6

Anything else?

Reproduces on stable, beta and nightly.