120 lines
2.0 KiB
Rust
120 lines
2.0 KiB
Rust
//@run-rustfix
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#![allow(unused)]
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#![warn(clippy::default_constructed_unit_structs)]
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use std::marker::PhantomData;
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#[derive(Default)]
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struct UnitStruct;
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impl UnitStruct {
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fn new() -> Self {
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//should lint
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Self
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}
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}
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#[derive(Default)]
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struct TupleStruct(usize);
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impl TupleStruct {
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fn new() -> Self {
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// should not lint
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Self(Default::default())
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}
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}
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// no lint for derived impl
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#[derive(Default)]
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struct NormalStruct {
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inner: PhantomData<usize>,
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}
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struct NonDefaultStruct;
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impl NonDefaultStruct {
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fn default() -> Self {
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Self
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}
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}
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#[derive(Default)]
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enum SomeEnum {
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#[default]
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Unit,
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Tuple(UnitStruct),
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Struct {
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inner: usize,
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},
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}
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impl NormalStruct {
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fn new() -> Self {
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// should lint
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Self {
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inner: PhantomData,
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}
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}
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fn new2() -> Self {
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// should not lint
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Self {
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inner: Default::default(),
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}
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}
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}
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#[derive(Default)]
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struct GenericStruct<T> {
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t: T,
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}
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impl<T: Default> GenericStruct<T> {
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fn new() -> Self {
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// should not lint
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Self { t: T::default() }
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}
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fn new2() -> Self {
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// should not lint
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Self { t: Default::default() }
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}
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}
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struct FakeDefault;
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impl FakeDefault {
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fn default() -> Self {
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Self
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}
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}
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impl Default for FakeDefault {
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fn default() -> Self {
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Self
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}
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}
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#[derive(Default)]
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struct EmptyStruct {}
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#[derive(Default)]
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#[non_exhaustive]
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struct NonExhaustiveStruct;
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fn main() {
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// should lint
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let _ = PhantomData::<usize>;
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let _: PhantomData<i32> = PhantomData;
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let _ = UnitStruct;
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// should not lint
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let _ = TupleStruct::default();
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let _ = NormalStruct::default();
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let _ = NonExhaustiveStruct::default();
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let _ = SomeEnum::default();
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let _ = NonDefaultStruct::default();
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let _ = EmptyStruct::default();
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let _ = FakeDefault::default();
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let _ = <FakeDefault as Default>::default();
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}
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