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Diffstat (limited to 'src/test/ui/consts/const-try.rs')
-rw-r--r-- | src/test/ui/consts/const-try.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/consts/const-try.rs b/src/test/ui/consts/const-try.rs new file mode 100644 index 000000000..e199fd9ff --- /dev/null +++ b/src/test/ui/consts/const-try.rs @@ -0,0 +1,39 @@ +// check-pass + +// Demonstrates what's needed to make use of `?` in const contexts. + +#![crate_type = "lib"] +#![feature(try_trait_v2)] +#![feature(const_trait_impl)] +#![feature(const_try)] + +use std::ops::{ControlFlow, FromResidual, Try}; + +struct TryMe; +struct Error; + +impl const FromResidual<Error> for TryMe { + fn from_residual(residual: Error) -> Self { + TryMe + } +} + +impl const Try for TryMe { + type Output = (); + type Residual = Error; + fn from_output(output: Self::Output) -> Self { + TryMe + } + fn branch(self) -> ControlFlow<Self::Residual, Self::Output> { + ControlFlow::Break(Error) + } +} + +const fn t() -> TryMe { + TryMe?; + TryMe +} + +const _: () = { + t(); +}; |