typeck: resolve type vars before calling `try_index_step`

`try_index_step` does not resolve type variables by itself and would
fail otherwise. Also harden the failure path in `confirm` to cause less
confusing errors.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/librustc_errors/lib.rs b/src/librustc_errors/lib.rs
index da29e354a70..cc8012d965a 100644
--- a/src/librustc_errors/lib.rs
+++ b/src/librustc_errors/lib.rs
@@ -375,6 +375,9 @@ impl Handler {
         panic!(ExplicitBug);
     }
     pub fn delay_span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
+        if self.treat_err_as_bug {
+            self.span_bug(sp, msg);
+        }
         let mut delayed = self.delayed_span_bug.borrow_mut();
         *delayed = Some((sp.into(), msg.to_string()));
     }