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error: macro expansion ignores token `=>` and any following
--> $DIR/macro-expand-to-match-arm.rs:3:18
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LL | $pattern => $block
| ^^
...
LL | arm!(None => {}),
| ---------------- caused by the macro expansion here
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= note: the usage of `arm!` is likely invalid in pattern context
= note: macros cannot expand to match arms
error: aborting due to 1 previous error
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