impl From<NoneError> for anyhow::Error about anyhow HOT 6 CLOSED

More concise way, that was non-obvious to me:

use anyhow::{Context, Result};

fn maybe_get() -> Option<T> {
    ...
}

fn demo() -> Result<()> {
    let t = maybe_get().context("there is no T")?;
    ...
}

from https://docs.rs/anyhow/1.0.31/anyhow/trait.Context.html#impl-Context%3CT%2C%20Infallible%3E-for-Option%3CT%3E

from anyhow.

Context is waaay better than what I've been using. Thanks!

 .ok_or(anyhow!("there is no T"))?;

vs

.context("there is no T")?;

from anyhow.

This impl wouldn't be allowed in anyhow by coherence, so we can't add this.

from anyhow.

Ah, forgot about that. Thanks for the quick response :)

from anyhow.

So if we can't use a From, what is the standard way to deal with an error like NoneError?

from anyhow.

Never mind! I think this is the common way: #35 (comment)

from anyhow.