35 lines
920 B
Rust
35 lines
920 B
Rust
#![warn(clippy::unit_hash)]
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#![allow(clippy::let_unit_value)]
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use std::collections::hash_map::DefaultHasher;
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use std::hash::Hash;
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enum Foo {
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Empty,
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WithValue(u8),
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}
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fn do_nothing() {}
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fn main() {
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let mut state = DefaultHasher::new();
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let my_enum = Foo::Empty;
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match my_enum {
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Foo::Empty => ().hash(&mut state),
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//~^ ERROR: this call to `hash` on the unit type will do nothing
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//~| NOTE: the implementation of `Hash` for `()` is a no-op
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Foo::WithValue(x) => x.hash(&mut state),
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}
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let res = ();
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res.hash(&mut state);
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//~^ ERROR: this call to `hash` on the unit type will do nothing
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//~| NOTE: the implementation of `Hash` for `()` is a no-op
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#[allow(clippy::unit_arg)]
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do_nothing().hash(&mut state);
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//~^ ERROR: this call to `hash` on the unit type will do nothing
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//~| NOTE: the implementation of `Hash` for `()` is a no-op
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}
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