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