move required_consts check to general post-mono-check function

Author: RalfJung

clippy_lints/src/non_copy_const.rs

@@ -204,7 +204,7 @@ fn is_value_unfrozen_raw<'tcx>(
             // similar to 2., but with the a frozen variant) (e.g. borrowing
             // `borrow_interior_mutable_const::enums::AssocConsts::TO_BE_FROZEN_VARIANT`).
             // I chose this way because unfrozen enums as assoc consts are rare (or, hopefully, none).
-            err == ErrorHandled::TooGeneric
+            matches!(err, ErrorHandled::TooGeneric(..))
         },
         |val| val.map_or(true, |val| inner(cx, val, ty)),
     )
@@ -244,8 +244,8 @@ pub fn const_eval_resolve<'tcx>(
             };
             tcx.const_eval_global_id_for_typeck(param_env, cid, span)
         },
-        Ok(None) => Err(ErrorHandled::TooGeneric),
-        Err(err) => Err(ErrorHandled::Reported(err.into())),
+        Ok(None) => Err(ErrorHandled::TooGeneric(span.unwrap_or(rustc_span::DUMMY_SP))),
+        Err(err) => Err(ErrorHandled::Reported(err.into(), span.unwrap_or(rustc_span::DUMMY_SP))),
     }
 }