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Diffstat (limited to '')
| -rw-r--r-- | src/test/ui/try-trait/try-on-option.stderr | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/try-trait/try-on-option.stderr b/src/test/ui/try-trait/try-on-option.stderr new file mode 100644 index 000000000..ba85a7cad --- /dev/null +++ b/src/test/ui/try-trait/try-on-option.stderr @@ -0,0 +1,32 @@ +error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result` + --> $DIR/try-on-option.rs:5:6 + | +LL | / fn foo() -> Result<u32, ()> { +LL | | let x: Option<u32> = None; +LL | | x?; + | | ^ use `.ok_or(...)?` to provide an error compatible with `Result<u32, ()>` +LL | | Ok(22) +LL | | } + | |_- this function returns a `Result` + | + = help: the trait `FromResidual<Option<Infallible>>` is not implemented for `Result<u32, ()>` + = help: the following other types implement trait `FromResidual<R>`: + <Result<T, F> as FromResidual<Result<Infallible, E>>> + <Result<T, F> as FromResidual<Yeet<E>>> + +error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`) + --> $DIR/try-on-option.rs:11:6 + | +LL | / fn bar() -> u32 { +LL | | let x: Option<u32> = None; +LL | | x?; + | | ^ cannot use the `?` operator in a function that returns `u32` +LL | | 22 +LL | | } + | |_- this function should return `Result` or `Option` to accept `?` + | + = help: the trait `FromResidual<Option<Infallible>>` is not implemented for `u32` + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0277`. |