rust-clippy/tests/ui/unwrap_or_else_default.rs

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// run-rustfix
#![warn(clippy::unwrap_or_else_default)]
#![allow(dead_code)]
#![allow(clippy::unnecessary_wraps)]
/// Checks implementation of the `UNWRAP_OR_ELSE_DEFAULT` lint.
fn unwrap_or_else_default() {
struct Foo;
impl Foo {
fn new() -> Foo {
Foo
}
// fake default, we should not trigger on this
fn default() -> Foo {
Foo
}
}
struct HasDefaultAndDuplicate;
impl HasDefaultAndDuplicate {
fn default() -> Self {
HasDefaultAndDuplicate
}
}
impl Default for HasDefaultAndDuplicate {
fn default() -> Self {
HasDefaultAndDuplicate
}
}
enum Enum {
A(),
}
fn make<T, V>(_: V) -> T {
unimplemented!();
}
let with_enum = Some(Enum::A());
with_enum.unwrap_or_else(Enum::A);
let with_new = Some(vec![1]);
with_new.unwrap_or_else(Vec::new);
let with_err: Result<_, ()> = Ok(vec![1]);
with_err.unwrap_or_else(make);
// should not be changed
let with_fake_default = None::<Foo>;
with_fake_default.unwrap_or_else(Foo::default);
// should not be changed
let with_fake_default2 = None::<HasDefaultAndDuplicate>;
with_fake_default2.unwrap_or_else(<HasDefaultAndDuplicate>::default);
let with_real_default = None::<HasDefaultAndDuplicate>;
with_real_default.unwrap_or_else(<HasDefaultAndDuplicate as Default>::default);
let with_default_trait = Some(1);
with_default_trait.unwrap_or_else(Default::default);
let with_default_type = Some(1);
with_default_type.unwrap_or_else(u64::default);
}
fn main() {}