Rollup merge of #89487 - FabianWolff:issue-89396, r=petrochenkov

Try to recover from a `=>` -> `=` or `->` typo in a match arm

Fixes #89396.

compiler/rustc_ast/src/token.rs

@@ -295,6 +295,7 @@ impl TokenKind {
         match *self {
             Comma => Some(vec![Dot, Lt, Semi]),
             Semi => Some(vec![Colon, Comma]),
+            FatArrow => Some(vec![Eq, RArrow]),
             _ => None,
         }
     }