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rust-clippy/tests/ui/double_must_use.rs
Andre Bogus cc622608db new lints around #[must_use] fns
`must_use_unit` lints unit-returning functions with a `#[must_use]`
attribute, suggesting to remove it.

`double_must_use` lints functions with a plain `#[must_use]`
attribute, but which return a type which is already `#[must_use]`,
so the attribute has no benefit.

`must_use_candidate` is a pedantic lint that lints functions and
methods that return some non-unit type that is not already
`#[must_use]` and suggests to add the annotation.
2019-10-14 12:09:04 +02:00

27 lines
474 B
Rust

#![warn(clippy::double_must_use)]
#[must_use]
pub fn must_use_result() -> Result<(), ()> {
unimplemented!();
}
#[must_use]
pub fn must_use_tuple() -> (Result<(), ()>, u8) {
unimplemented!();
}
#[must_use]
pub fn must_use_array() -> [Result<(), ()>; 1] {
unimplemented!();
}
#[must_use = "With note"]
pub fn must_use_with_note() -> Result<(), ()> {
unimplemented!();
}
fn main() {
must_use_result();
must_use_tuple();
must_use_with_note();
}