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error: `must_not_suspend` attribute should be applied to a struct, enum, or trait
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--> $DIR/return.rs:5:1
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LL | #[must_not_suspend]
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| ^^^^^^^^^^^^^^^^^^^
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LL | / fn foo() -> i32 {
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LL | | 0
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LL | | }
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| |_- is not a struct, enum, or trait
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error: aborting due to 1 previous error
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