drive-by: Fix path spans

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -2302,7 +2302,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                                 )
                             };
                             let mut suggestions = vec![(
-                                trait_path_segment.ident.span.shrink_to_lo(),
+                                path.span.shrink_to_lo(),
                                 format!("<{} as ", self.tcx.type_of(impl_def_id))
                             )];
                             if let Some(generic_arg) = trait_path_segment.args {