1error[E0308]: mismatched types 2 --> $DIR/tail-typeck.rs:3:26 3 | 4LL | fn f() -> isize { return g(); } 5 | ----- ^^^ expected `isize`, found `usize` 6 | | 7 | expected `isize` because of return type 8 | 9help: you can convert a `usize` to an `isize` and panic if the converted value doesn't fit 10 | 11LL | fn f() -> isize { return g().try_into().unwrap(); } 12 | ++++++++++++++++++++ 13 14error: aborting due to previous error 15 16For more information about this error, try `rustc --explain E0308`. 17