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error[E0308]: mismatched types
--> $DIR/issue-102206.rs:6:27
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LL | std::mem::size_of_val(foo());
| --------------------- ^^^^^
| | |
| | expected reference, found opaque type
| | help: consider borrowing here: `&foo()`
| arguments to this function are incorrect
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note: while checking the return type of the `async fn`
--> $DIR/issue-102206.rs:3:16
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LL | async fn foo() {}
| ^ checked the `Output` of this `async fn`, found opaque type
= note: expected reference `&_`
found opaque type `impl Future<Output = ()>`
note: function defined here
--> $SRC_DIR/core/src/mem/mod.rs:LL:COL
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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