cargo_is_tested/lints/
emptiness.rs

1//! \[**Warn**\] Lints when items are empty.
2//!
3//! ### Example
4//!
5//! ```rust, ignore
6//! fn main() {}
7//! ```
8//!
9//! Will trigger this lint.
10
11use crate::impl_warn;
12
13use super::{super::span, Pass};
14use miette::Result;
15use miette::{Diagnostic, NamedSource, SourceSpan};
16use syn::{spanned::Spanned, Item};
17use thiserror::Error;
18
19#[rustfmt::skip]
20#[derive(Debug, Error, Diagnostic)]
21#[error("Empty items aren't recommended")]
22#[diagnostic(
23	code(EMPTY_ITEM),
24	severity(Warning)
25)]
26pub struct Emptiness {
27    #[source_code]
28    src: NamedSource,
29    #[label("right here")]
30    span: SourceSpan,
31}
32
33impl Pass for Emptiness {
34    fn check_items(source: &str, filename: &str, items: &Vec<Item>) -> Result<()> {
35        for item in items {
36            if let Item::Fn(func) = item {
37                if func.block.stmts.is_empty() {
38                    Err(Emptiness {
39                        src: NamedSource::new(filename, source.to_owned()),
40                        span: span!(func.sig, source),
41                    })?;
42                }
43            }
44        }
45        Ok(())
46    }
47}
48
49impl_warn! { Emptiness }
cargo_is_tested/lints/emptiness.rs

cargo_is_tested/lints/
emptiness.rs
