mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-10 15:14:29 +00:00
141 lines
2.9 KiB
Rust
141 lines
2.9 KiB
Rust
#![warn(clippy::needless_question_mark)]
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#![allow(
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clippy::needless_return,
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clippy::unnecessary_unwrap,
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clippy::upper_case_acronyms,
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dead_code,
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unused_must_use
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)]
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struct TO {
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magic: Option<usize>,
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}
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struct TR {
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magic: Result<usize, bool>,
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}
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fn simple_option_bad1(to: TO) -> Option<usize> {
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// return as a statement
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return to.magic;
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}
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// formatting will add a semi-colon, which would make
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// this identical to the test case above
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#[rustfmt::skip]
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fn simple_option_bad2(to: TO) -> Option<usize> {
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// return as an expression
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return to.magic
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}
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fn simple_option_bad3(to: TO) -> Option<usize> {
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// block value "return"
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to.magic
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}
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fn simple_option_bad4(to: Option<TO>) -> Option<usize> {
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// single line closure
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to.and_then(|t| t.magic)
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}
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// formatting this will remove the block brackets, making
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// this test identical to the one above
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#[rustfmt::skip]
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fn simple_option_bad5(to: Option<TO>) -> Option<usize> {
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// closure with body
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to.and_then(|t| {
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t.magic
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})
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}
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fn simple_result_bad1(tr: TR) -> Result<usize, bool> {
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return tr.magic;
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}
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// formatting will add a semi-colon, which would make
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// this identical to the test case above
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#[rustfmt::skip]
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fn simple_result_bad2(tr: TR) -> Result<usize, bool> {
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return tr.magic
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}
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fn simple_result_bad3(tr: TR) -> Result<usize, bool> {
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tr.magic
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}
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fn simple_result_bad4(tr: Result<TR, bool>) -> Result<usize, bool> {
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tr.and_then(|t| t.magic)
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}
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// formatting this will remove the block brackets, making
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// this test identical to the one above
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#[rustfmt::skip]
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fn simple_result_bad5(tr: Result<TR, bool>) -> Result<usize, bool> {
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tr.and_then(|t| {
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t.magic
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})
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}
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fn also_bad(tr: Result<TR, bool>) -> Result<usize, bool> {
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if tr.is_ok() {
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let t = tr.unwrap();
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return t.magic;
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}
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Err(false)
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}
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fn false_positive_test<U, T>(x: Result<(), U>) -> Result<(), T>
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where
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T: From<U>,
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{
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Ok(x?)
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}
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// not quite needless
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fn deref_ref(s: Option<&String>) -> Option<&str> {
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Some(s?)
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}
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fn main() {}
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// #6921 if a macro wraps an expr in Some( ) and the ? is in the macro use,
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// the suggestion fails to apply; do not lint
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macro_rules! some_in_macro {
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($expr:expr) => {
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|| -> _ { Some($expr) }()
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};
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}
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pub fn test1() {
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let x = Some(3);
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let _x = some_in_macro!(x?);
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}
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// this one is ok because both the ? and the Some are both inside the macro def
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macro_rules! some_and_qmark_in_macro {
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($expr:expr) => {
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|| -> Option<_> { Some($expr) }()
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};
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}
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pub fn test2() {
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let x = Some(3);
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let _x = some_and_qmark_in_macro!(x?);
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}
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async fn async_option_bad(to: TO) -> Option<usize> {
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let _ = Some(3);
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to.magic
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}
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async fn async_deref_ref(s: Option<&String>) -> Option<&str> {
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Some(s?)
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}
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async fn async_result_bad(s: TR) -> Result<usize, bool> {
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s.magic
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}
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async fn async_wrapped<T>(a: Option<T>) -> Option<T> {
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{ a }
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}
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