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Don't allocate in success case (#506)

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`format!` was being called (and allocating a string) even in the success case.
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Andrew Walbran 2023-03-15 08:06:35 +00:00 committed by GitHub
parent 9ee562c267
commit 7a22d5567a
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src/error-handling/error-contexts.md
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@ -12,7 +12,7 @@ use anyhow::{Context, Result, bail};
fn read_username(path: &str) -> Result<String> {
let mut username = String::with_capacity(100);
fs::File::open(path)
.context(format!("Failed to open {path}"))?
.with_context(|| format!("Failed to open {path}"))?
.read_to_string(&mut username)
.context("Failed to read")?;
if username.is_empty() {