wasi_common/
error.rs

1//! wasi-common uses an [`Error`] type which represents either a preview 1 [`Errno`] enum, on
2//! [`anyhow::Error`] for trapping execution.
3//!
4//! The user can construct an [`Error`] out of an [`Errno`] using the `From`/`Into` traits.
5//! They may also use [`Error::trap`] to construct an error that traps execution. The contents
6//! can be inspected with [`Error::downcast`] and [`Error::downcast_ref`]. Additional context
7//! can be provided with the [`Error::context`] method. This context is only observable with the
8//! `Display` and `Debug` impls of the error.
9
10pub use crate::snapshots::preview_1::error::{Error, ErrorExt};
11use std::fmt;
12
13/// An error returned from the `proc_exit` host syscall.
14///
15/// Embedders can test if an error returned from wasm is this error, in which
16/// case it may signal a non-fatal trap.
17#[derive(Debug)]
18pub struct I32Exit(pub i32);
19
20impl fmt::Display for I32Exit {
21    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
22        write!(f, "Exited with i32 exit status {}", self.0)
23    }
24}
25
26impl std::error::Error for I32Exit {}
wasi_common/error.rs

wasi_common/
error.rs
