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error: macro expansion ends with an incomplete expression: expected expression
--> $DIR/macro-in-expression-context-2.rs:5:16
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LL | macro_rules! empty { () => () }
| -- in this macro arm
...
LL | _ => { empty!() }
| ^^^^^^^^ expected expression
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= note: the macro call doesn't expand to an expression, but it can expand to a statement
help: add `;` to interpret the expansion as a statement
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LL | _ => { empty!(); }
| +
error: aborting due to previous error
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