Merge ref '32e7a4b92b10' from rust-lang/rust

Pull recent changes from https://github.com/rust-lang/rust via Josh.

Upstream ref: 32e7a4b92b109c24e9822c862a7c74436b50e564
Filtered ref: d39f3479bfafb04026ed3afec68aa671d13e9c3c

This merge was created using https://github.com/rust-lang/josh-sync.

1 files changed, 5 insertions, 1 deletions

diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index 3d89530f914..54d8a791025 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -785,9 +785,13 @@ impl<'a> Parser<'a> {
                     ExprKind::Call(_, _) => "a function call",
                     ExprKind::Await(_, _) => "`.await`",
                     ExprKind::Use(_, _) => "`.use`",
+                    ExprKind::Yield(YieldKind::Postfix(_)) => "`.yield`",
                     ExprKind::Match(_, _, MatchKind::Postfix) => "a postfix match",
                     ExprKind::Err(_) => return Ok(with_postfix),
-                    _ => unreachable!("parse_dot_or_call_expr_with_ shouldn't produce this"),
+                    _ => unreachable!(
+                        "did not expect {:?} as an illegal postfix operator following cast",
+                        with_postfix.kind
+                    ),
                 }
             );
             let mut err = self.dcx().struct_span_err(span, msg);