Hook up error propagation #381
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syrusakbary
reviewed
Apr 22, 2019
syrusakbary
reviewed
Apr 22, 2019
| @@ -63,5 +70,11 @@ fn main() -> Result<(), error::Error> { | |||
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| println!("result: {:?}", result); | |||
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| if let Err(RuntimeError::Error { data }) = result { | |||
| if let Ok(exit_code) = data.downcast::<ExitCode>() { | |||
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bors try |
syrusakbary
approved these changes
Apr 22, 2019
|
bors r+ |
bors bot
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Apr 22, 2019
381: Hook up error propagation r=lachlansneff a=lachlansneff
You can now retrieve the error from a panicking or error-returning imported function.
Example:
```rust
#[derive(Debug)]
struct ExitCode {
code: i32,
}
fn do_panic(_ctx: &mut Ctx) -> Result<i32, ExitCode> {
Err(ExitCode { code: 42 })
}
// This wasm functions calls `do_panic`.
let foo: Func<(), i32> = instance.func(...)?;
let result = foo.call();
println!("result: {:?}", result);
if let Err(RuntimeError::Error { data }) = result {
if let Ok(exit_code) = data.downcast::<ExitCode>() {
println!("exit code: {:?}", exit_code);
}
}
```
outputs:
```
result: Err(unknown error)
exit code: ExitCode { code: 42 }
```
Co-authored-by: Lachlan Sneff <lachlan.sneff@gmail.com>
bjfish
approved these changes
Apr 22, 2019
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You can now retrieve the error from a panicking or error-returning imported function.
Example:
outputs: