103 lines
1.9 KiB
Rust
103 lines
1.9 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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struct One;
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#[deny(len_without_is_empty)]
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impl One {
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fn len(self: &Self) -> isize { //~ERROR Item 'One' has a '.len(_: &Self)'
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1
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}
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}
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#[deny(len_without_is_empty)]
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trait TraitsToo {
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fn len(self: &Self) -> isize; //~ERROR Trait 'TraitsToo' has a '.len(_:
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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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struct HasIsEmpty;
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#[deny(len_without_is_empty)]
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impl HasIsEmpty {
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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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struct Wither;
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#[deny(len_without_is_empty)]
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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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struct HasWrongIsEmpty;
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#[deny(len_without_is_empty)]
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impl HasWrongIsEmpty {
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fn len(self: &Self) -> isize { //~ERROR Item 'HasWrongIsEmpty' has a '.len(_: &Self)'
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1
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}
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#[allow(dead_code, unused)]
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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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#[deny(len_zero)]
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fn main() {
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let x = [1, 2];
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if x.len() == 0 { //~ERROR Consider replacing the len comparison
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println!("This should not happen!");
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}
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let y = One;
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if y.len() == 0 { //no error because 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 : &TraitsToo = &y;
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if z.len() > 0 { //no error, because TraitsToo has no .is_empty() method
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println!("Nor should this!");
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}
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let hie = HasIsEmpty;
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if hie.len() == 0 { //~ERROR Consider replacing the len comparison
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println!("Or this!");
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}
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assert!(!hie.is_empty());
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let wie : &WithIsEmpty = &Wither;
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if wie.len() == 0 { //~ERROR Consider replacing the len comparison
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println!("Or this!");
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}
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assert!(!wie.is_empty());
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let hwie = HasWrongIsEmpty;
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if hwie.len() == 0 { //no error as 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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