c3301503b9
Full list of `impl const Default` types: - () - bool - char - Cell - std::ascii::Char - usize - u8 - u16 - u32 - u64 - u128 - i8 - i16 - i32 - i64 - i128 - f16 - f32 - f64 - f128 - std::marker::PhantomData<T> - Option<T> - std::iter::Empty<T> - std::ptr::Alignment - &[T] - &mut [T] - &str - &mut str - String - Vec<T>
27 lines
538 B
Rust
27 lines
538 B
Rust
#![deny(dead_code)] //~ NOTE the lint level is defined here
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#[derive(Default)]
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struct T; //~ ERROR struct `T` is never constructed
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#[derive(Default)]
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struct Used;
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#[derive(Default)]
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enum E { //~ NOTE variant in this enum
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#[default]
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A,
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B, //~ ERROR variant `B` is never constructed
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}
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// external crate can call T2::default() to construct T2,
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// so that no warnings for pub adts
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#[derive(Default)]
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pub struct T2 {
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_unread: i32,
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}
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fn main() {
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let _x: Used = Default::default();
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let _e: E = Default::default();
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}
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