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error: macro expansion ignores token `=>` and any following
  --> $DIR/macro-expand-to-match-arm.rs:3:18
   |
LL |         $pattern => $block
   |                  ^^
...
LL |         arm!(None => {}),
   |         ---------------- caused by the macro expansion here
   |
   = note: the usage of `arm!` is likely invalid in pattern context
   = note: macros cannot expand to match arms

error: `match` arm with no body
  --> $DIR/macro-expand-to-match-arm.rs:14:9
   |
LL |         arm!(None => {}),
   |         ^^^^^^^^^^^^^^^^- help: add a body after the pattern: `=> todo!(),`

error: aborting due to 2 previous errors