51 lines
993 B
Rust
51 lines
993 B
Rust
#![warn(clippy::needless_as_bytes)]
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#![allow(clippy::const_is_empty)]
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struct S;
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impl S {
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fn as_bytes(&self) -> &[u8] {
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&[]
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}
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}
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fn main() {
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if "some string".as_bytes().is_empty() {
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//~^ needless_as_bytes
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println!("len = {}", "some string".as_bytes().len());
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//~^ needless_as_bytes
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}
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let s = String::from("yet another string");
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if s.as_bytes().is_empty() {
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//~^ needless_as_bytes
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println!("len = {}", s.as_bytes().len());
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//~^ needless_as_bytes
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}
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// Do not lint
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let _ = S.as_bytes().is_empty();
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let _ = S.as_bytes().len();
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let _ = (&String::new() as &dyn AsBytes).as_bytes().len();
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macro_rules! m {
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(1) => {
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""
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};
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(2) => {
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"".as_bytes()
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};
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}
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m!(1).as_bytes().len();
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m!(2).len();
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}
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pub trait AsBytes {
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fn as_bytes(&self) -> &[u8];
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}
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impl AsBytes for String {
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fn as_bytes(&self) -> &[u8] {
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&[]
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}
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}
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