Comments (4)
You could make a macro that captures both in one call:
use anyhow::{bail, Context, Result};
macro_rules! here {
() => {
concat!("at ", file!(), " line ", line!(), " column ", column!())
};
}
fn f() -> Result<()> {
bail!("oh no!");
}
fn main() -> Result<()> {
f().context(here!())?;
Ok(())
}
Error: at src/main.rs line 14 column 17
Caused by:
oh no!
Or get a little fancier with an extension trait:
use anyhow::{bail, Context, Result};
use std::fmt::Display;
pub struct Location {
file: &'static str,
line: u32,
column: u32,
}
pub trait ErrorLocation<T, E> {
fn location(self, loc: &'static Location) -> Result<T>;
}
impl<T, E> ErrorLocation<T, E> for Result<T, E>
where
E: Display,
Result<T, E>: Context<T, E>,
{
fn location(self, loc: &'static Location) -> Result<T> {
let msg = self.as_ref().err().map(ToString::to_string);
self.with_context(|| format!(
"{} at {} line {} column {}",
msg.unwrap(), loc.file, loc.line, loc.column,
))
}
}
macro_rules! here {
() => {
&Location {
file: file!(),
line: line!(),
column: column!(),
}
};
}
fn f() -> Result<()> {
bail!("oh no!");
}
fn main() -> Result<()> {
f().location(here!())?;
Ok(())
}
from anyhow.
No way to go without a macro, I guess? Well, even like this, it's almost perfect :) Do you plan adding such macro to a crate itself?
from anyhow.
std errors will contain backtraces in the future: rust-lang/rust#53487
from anyhow.
I'll stick with macro then, until the backtrace in std is usable. Thanks @dtolnay @est31 !
from anyhow.
Related Issues (20)
- Should `anyhow::Error::chain` return `dyn Error + Send + Sync` HOT 2
- Customize backtrace logic?
- `anyhow!(e)` doesn't preserve `source` for `&Error` HOT 1
- A way to disable anyhow stacktraces (without disabling stacktraces from other crates) HOT 2
- Default Ok-type to `()` in `anyhow::Result` typedef HOT 2
- Updating from version 1.0.76 breaks backtraces HOT 2
- Make backtrace support optional HOT 10
- Possible performance regression on Windows HOT 5
- as_ref() type must be known at this point
- Depending on `CARGO_ENCODED_RUSTFLAGS` may produce stale builds HOT 1
- rust-analyzer nightly throws needless_return warning on bail! HOT 2
- Implement Context for Error
- Question regarding stacktrace
- anyhow::Error to Box<dyn Error> isn't compatible with other libraries HOT 2
- Are you open to de-duplicating the build.rs build probe code? HOT 7
- `anyhow::ensure!` doesn't work with custom error type HOT 1
- Short backtrace HOT 2
- Feature suggestion: ensure_some!() for unwrapping options HOT 3
- Cannot compile when using `ensure!` HOT 1
- Unsound usages of unsafe implementation from `u8` to `str` HOT 2
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from anyhow.