Don't Create ParamCandidate When Obligation Contains Errors

Fixes rust-lang#121941

Author: veera-sivarajan

compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs

@@ -219,6 +219,10 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     ) -> Result<(), SelectionError<'tcx>> {
         debug!(?stack.obligation);
 
+        if stack.obligation.predicate.references_error() {
+            return Ok(());
+        }
+
         let all_bounds = stack
             .obligation
             .param_env