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error[E0308]: mismatched types
--> $DIR/tail-typeck.rs:3:26
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LL | fn f() -> isize { return g(); }
| ----- ^^^ expected `isize`, found `usize`
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| expected `isize` because of return type
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help: you can convert a `usize` to an `isize` and panic if the converted value doesn't fit
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LL | fn f() -> isize { return g().try_into().unwrap(); }
| ++++++++++++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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