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// build-fail
// compile-flags:-Zpolymorphize=on
#![feature(rustc_attrs)]
// This test checks that the polymorphization analysis correctly detects unused type
// parameters in functions.
// Function doesn't have any generic parameters to be unused.
#[rustc_polymorphize_error]
pub fn no_parameters() {}
// Function has an unused generic parameter.
#[rustc_polymorphize_error]
pub fn unused<T>() {
//~^ ERROR item has unused generic parameters
}
// Function uses generic parameter in value of a binding.
#[rustc_polymorphize_error]
pub fn used_binding_value<T: Default>() {
let _: T = Default::default();
}
// Function uses generic parameter in generic of a binding.
#[rustc_polymorphize_error]
pub fn used_binding_generic<T>() {
let _: Option<T> = None;
}
// Function uses generic parameter in argument.
#[rustc_polymorphize_error]
pub fn used_argument<T>(_: T) {}
// Function uses generic parameter in substitutions to another function.
#[rustc_polymorphize_error]
pub fn used_substs<T>() {
unused::<T>()
}
struct Foo<F>(F);
impl<F: Default> Foo<F> {
// Function has an unused generic parameter from impl.
#[rustc_polymorphize_error]
pub fn unused_impl() {
//~^ ERROR item has unused generic parameters
}
// Function has an unused generic parameter from impl and fn.
#[rustc_polymorphize_error]
pub fn unused_both<G: Default>() {
//~^ ERROR item has unused generic parameters
}
// Function uses generic parameter from impl.
#[rustc_polymorphize_error]
pub fn used_impl() {
let _: F = Default::default();
}
// Function uses generic parameter from impl.
#[rustc_polymorphize_error]
pub fn used_fn<G: Default>() {
//~^ ERROR item has unused generic parameters
let _: G = Default::default();
}
// Function uses generic parameter from impl.
#[rustc_polymorphize_error]
pub fn used_both<G: Default>() {
let _: F = Default::default();
let _: G = Default::default();
}
// Function uses generic parameter in substitutions to another function.
#[rustc_polymorphize_error]
pub fn used_substs() {
unused::<F>()
}
}
fn main() {
no_parameters();
unused::<u32>();
used_binding_value::<u32>();
used_binding_generic::<u32>();
used_argument(3u32);
used_substs::<u32>();
Foo::<u32>::unused_impl();
Foo::<u32>::unused_both::<u32>();
Foo::<u32>::used_impl();
Foo::<u32>::used_fn::<u32>();
Foo::<u32>::used_both::<u32>();
Foo::<u32>::used_substs();
}
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