Provide suggestion when encountering `match () { () => 1 } + match () { () => 1 }`

```
error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:69:5
   |
LL |     match () { () => 1 } + match () { () => 1 }
   |     ^^^^^^^^^^^^^^^^^^^^ expected `()`, found integer
   |
help: consider using a semicolon here
   |
LL |     match () { () => 1 }; + match () { () => 1 }
   |                         +
help: alternatively, parentheses are required to parse this as an expression
   |
LL |     (match () { () => 1 }) + match () { () => 1 }
   |     +                    +
```

Parentheses are needed for the `match` to be unambiguously parsed as an expression and not a statement when chaining with binops that are also unops.

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