Macro try_cek

macro_rules! try_cek {
    ($result:expr) => { ... };
}

Propagates a catchable error as Ok(Err(_)) or returns the unwrapped value in Ok.

You should use the try operator (?) to propagate uncatchable errors before passing catchable errors to try_cek.

Input type: Result<T, CatchableErrorKind>

Output type: T

Return type of containing function: Result<Result<_, CatchableErrorKind>, _>

Example

use snix_eval::{try_cek, CatchableErrorKind};

fn my_fn() -> Result<Result<i32, CatchableErrorKind>, MyUncatchableError> {
    Ok(Ok(42))
}

let value: i32 = try_cek!(my_fn()?);
assert_eq!(value, 42);

fn my_other_fn() -> Result<Result<i32, CatchableErrorKind>, MyUncatchableError> {
    Ok(Err(CatchableErrorKind::AssertionFailed))
}

try_cek!(my_other_fn()?); // results in `return Ok(Err(cek))`
unreachable!();