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#[macro_use]
extern crate derive_builder;
/// A struct that deliberately doesn't implement `Clone`.
#[derive(Debug, Default, PartialEq, Eq)]
pub struct Dolor(String);
/// Notice that this type derives Builder without disallowing
/// `Lorem<Dolor>`.
#[derive(Debug, Clone, Builder, PartialEq, Eq, Default)]
#[builder(field(private), setter(into))]
pub struct Lorem<T> {
ipsum: T,
}
#[derive(Debug, Clone, Builder, PartialEq, Eq, Default)]
#[builder(field(private))]
pub struct VecLorem<T> {
ipsum: Vec<T>,
}
#[derive(Debug, Clone, Builder, PartialEq, Eq)]
#[builder(pattern = "owned", field(private))]
pub struct OwnedLorem<T> {
ipsum: T,
}
#[test]
fn generic_field_with_clone_has_builder_impl() {
assert_eq!(
LoremBuilder::default().ipsum(10).build().unwrap(),
Lorem { ipsum: 10 }
);
}
/// The `LoremBuilder` type does not require that `T: Clone`, so we should
/// be able to name a `LoremBuilder<Dolor>`. But all the methods are on an impl
/// bound with `T: Clone`, so we can't do anything with it.
#[test]
fn builder_with_non_clone_generic_compiles() {
let _: LoremBuilder<Dolor>;
}
/// In this case, we're trying to emit something that converts into a thing that
/// implements clone.
#[test]
fn builder_with_into_generic_compiles() {
assert_eq!(
LoremBuilder::<String>::default().ipsum("").build().unwrap(),
Lorem::default()
);
}
#[test]
fn builder_with_vec_t_compiles() {
assert_eq!(
VecLoremBuilder::<String>::default()
.ipsum(vec!["Hello".to_string()])
.build()
.unwrap(),
VecLorem {
ipsum: vec!["Hello".to_string()],
}
);
}
#[test]
fn generic_field_without_clone_has_owned_builder() {
assert_eq!(
OwnedLoremBuilder::default()
.ipsum(Dolor::default())
.build()
.unwrap(),
OwnedLorem {
ipsum: Dolor::default()
}
);
}
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