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//@ build-fail
//@ compile-flags:-Zpolymorphize=on
#![feature(fn_traits, rustc_attrs, unboxed_closures)]
// This test checks that the polymorphization analysis considers a closure
// as using all generic parameters if it does an unsizing cast.
#[rustc_polymorphize_error]
fn foo<T: Default>() {
let _: T = Default::default();
(|| Box::new(|| {}) as Box<dyn Fn()>)();
//~^ ERROR item has unused generic parameters
//~^^ ERROR item has unused generic parameters
}
#[rustc_polymorphize_error]
fn foo2<T: Default>() {
let _: T = Default::default();
(|| {
//~^ ERROR item has unused generic parameters
let call: extern "rust-call" fn(_, _) = Fn::call;
call(&|| {}, ());
//~^ ERROR item has unused generic parameters
})();
}
fn main() {
foo::<u32>();
foo2::<u32>();
}
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