152 lines
3.1 KiB
Rust
152 lines
3.1 KiB
Rust
// run-rustfix
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#![warn(clippy::len_zero)]
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#![allow(dead_code, unused, clippy::len_without_is_empty)]
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pub struct One;
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struct Wither;
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trait TraitsToo {
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fn len(self: &Self) -> isize;
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// No error; `len` is private; see issue #1085.
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}
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impl TraitsToo for One {
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fn len(self: &Self) -> isize {
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0
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}
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}
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pub struct HasIsEmpty;
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impl HasIsEmpty {
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pub fn len(self: &Self) -> isize {
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1
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}
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fn is_empty(self: &Self) -> bool {
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false
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}
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}
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pub struct HasWrongIsEmpty;
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impl HasWrongIsEmpty {
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pub fn len(self: &Self) -> isize {
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1
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}
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pub fn is_empty(self: &Self, x: u32) -> bool {
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false
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}
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}
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pub trait WithIsEmpty {
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fn len(self: &Self) -> isize;
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fn is_empty(self: &Self) -> bool;
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}
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impl WithIsEmpty for Wither {
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fn len(self: &Self) -> isize {
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1
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}
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fn is_empty(self: &Self) -> bool {
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false
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}
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}
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fn main() {
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let x = [1, 2];
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if x.is_empty() {
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println!("This should not happen!");
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}
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if "".is_empty() {}
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let y = One;
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if y.len() == 0 {
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// No error; `One` does not have `.is_empty()`.
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println!("This should not happen either!");
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}
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let z: &dyn TraitsToo = &y;
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if z.len() > 0 {
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// No error; `TraitsToo` has no `.is_empty()` method.
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println!("Nor should this!");
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}
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let has_is_empty = HasIsEmpty;
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if has_is_empty.is_empty() {
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println!("Or this!");
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}
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if !has_is_empty.is_empty() {
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println!("Or this!");
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}
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if !has_is_empty.is_empty() {
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println!("Or this!");
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}
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if has_is_empty.is_empty() {
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println!("Or this!");
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}
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if !has_is_empty.is_empty() {
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println!("Or this!");
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}
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if has_is_empty.len() > 1 {
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// No error.
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println!("This can happen.");
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}
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if has_is_empty.len() <= 1 {
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// No error.
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println!("This can happen.");
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}
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if has_is_empty.is_empty() {
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println!("Or this!");
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}
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if !has_is_empty.is_empty() {
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println!("Or this!");
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}
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if !has_is_empty.is_empty() {
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println!("Or this!");
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}
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if !has_is_empty.is_empty() {
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println!("Or this!");
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}
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if has_is_empty.is_empty() {
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println!("Or this!");
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}
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if 1 < has_is_empty.len() {
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// No error.
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println!("This can happen.");
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}
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if 1 >= has_is_empty.len() {
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// No error.
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println!("This can happen.");
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}
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assert!(!has_is_empty.is_empty());
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let with_is_empty: &dyn WithIsEmpty = &Wither;
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if with_is_empty.is_empty() {
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println!("Or this!");
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}
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assert!(!with_is_empty.is_empty());
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let has_wrong_is_empty = HasWrongIsEmpty;
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if has_wrong_is_empty.len() == 0 {
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// No error; `HasWrongIsEmpty` does not have `.is_empty()`.
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println!("Or this!");
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}
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}
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fn test_slice(b: &[u8]) {
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if !b.is_empty() {}
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}
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mod issue_3807 {
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// Avoid suggesting changes to ranges if the user did not enable `range_is_empty`.
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// See https://github.com/rust-lang/rust/issues/48111#issuecomment-445132965
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fn no_suggestion() {
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let _ = (0..42).len() == 0;
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}
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}
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