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// Make sure that an error is reported if the `call` function of the
// `fn`/`fn_mut` lang item is grossly ill-formed.
#![feature(lang_items)]
#![feature(no_core)]
#![no_core]
#[lang = "fn"]
trait MyFn<T> {
const call: i32 = 42;
//~^ ERROR: `call` trait item in `fn` lang item must be a function
}
#[lang = "fn_mut"]
trait MyFnMut<T> {
fn call(i: i32, j: i32) -> i32 { i + j }
//~^ ERROR: first argument of `call` in `fn_mut` lang item must be a reference
}
fn main() {
let a = || 42;
a();
let mut i = 0;
let mut b = || { i += 1; };
b();
}
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