Avoid ICEs

Author: estebank

src/librustc/traits/codegen/mod.rs

@@ -153,8 +153,8 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
         // contains unbound type parameters. It could be a slight
         // optimization to stop iterating early.
         if let Err(errors) = fulfill_cx.select_all_or_error(self) {
-            span_bug!(span, "Encountered errors `{:?}` resolving bounds after type-checking",
-                      errors);
+            debug!("Encountered errors `{:?}` resolving bounds after type-checking", errors);
+            self.report_fulfillment_errors(&errors, None, false);
         }
 
         let result = self.resolve_type_vars_if_possible(result);

src/librustc_mir/hair/pattern/check_match.rs

@@ -603,7 +603,9 @@ fn check_legality_of_move_bindings(
             E0009,
             "cannot bind by-move and by-ref in the same pattern",
         );
-        err.span_label(by_ref_span.unwrap(), "both by-ref and by-move used");
+        if let Some(by_ref_span) = by_ref_span {
+            err.span_label(by_ref_span, "both by-ref and by-move used");
+        }
         for span in span_vec.iter(){
             err.span_label(*span, "by-move pattern here");
         }

src/test/ui/consts/match_ice.rs

@@ -1,3 +1,4 @@
+//~ ERROR can't compare `S` with `S`
 // https://github.com/rust-lang/rust/issues/53708
 
 struct S;

src/test/ui/consts/match_ice.stderr

@@ -1,11 +1,17 @@
 error[E0004]: non-exhaustive patterns: `&S` not covered
-  --> $DIR/match_ice.rs:7:11
+  --> $DIR/match_ice.rs:8:11
    |
 LL |     match C {
    |           ^ pattern `&S` not covered
    |
    = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
 
-error: aborting due to previous error
+error[E0277]: can't compare `S` with `S`
+   |
+   = help: the trait `std::cmp::PartialEq` is not implemented for `S`
+   = note: required because of the requirements on the impl of `std::cmp::PartialEq` for `&S`
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0004`.
+Some errors occurred: E0004, E0277.
+For more information about an error, try `rustc --explain E0004`.