Updated the fix for rust-lang#85845

 - Made the check stricter.
**Note: I've checked and there is no other trait that can be possibly passed than std ones. (BinOps) so there is no need for a `can_derive` or something similar. Furthermore, this mean we can't pass another thing than a str.**

compiler/rustc_typeck/src/check/op.rs

@@ -960,7 +960,7 @@ fn suggest_impl_missing(err: &mut DiagnosticBuilder<'_>, ty: Ty<'_>, missing_tra
                 missing_trait, ty
             ));
             // This checks if the missing trait is PartialEq to suggest adding a derive
-            if missing_trait.ends_with("PartialEq") {
+            if missing_trait.ends_with("std::cmp::PartialEq") {
                 err.note(&format!(
                     "add `#[derive(PartialEq)]` or manually implement `PartialEq` for `{}`",
                     ty