396910a664
Do not suggest wrapping an item if it has ambiguous un-imported methods If the method is defined for the receiver we have, but is ambiguous during probe, then it probably comes from one of several traits that just weren't `use`d. Don't suggest wrapping the receiver in `Box`/etc., even if that makes the method probe unambiguous. Fixes #94218
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.