mirror of https://github.com/rust-lang/rust
62 lines
1.6 KiB
Rust
62 lines
1.6 KiB
Rust
// Checks that declaring a lang item with the wrong number of generic arguments errors rather than
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// crashing (issue #83474, #83893, #87573, part of #9307, #79559).
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#![feature(lang_items, no_core)]
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#![no_core]
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#[lang = "sized"]
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trait MySized {}
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#[lang = "add"]
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trait MyAdd<'a, T> {}
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//~^^ ERROR: `add` lang item must be applied to a trait with 1 generic argument [E0718]
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#[lang = "drop_in_place"]
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//~^ ERROR `drop_in_place` lang item must be applied to a function with at least 1 generic
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fn my_ptr_drop() {}
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#[lang = "index"]
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trait MyIndex<'a, T> {}
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//~^^ ERROR: `index` lang item must be applied to a trait with 1 generic argument [E0718]
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#[lang = "phantom_data"]
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//~^ ERROR `phantom_data` lang item must be applied to a struct with 1 generic argument
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struct MyPhantomData<T, U>;
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//~^ ERROR `T` is never used
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//~| ERROR `U` is never used
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#[lang = "owned_box"]
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//~^ ERROR `owned_box` lang item must be applied to a struct with at least 1 generic argument
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struct Foo;
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// When the `start` lang item is missing generics very odd things can happen, especially when
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// it comes to cross-crate monomorphization
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#[lang = "start"]
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//~^ ERROR `start` lang item must be applied to a function with 1 generic argument [E0718]
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fn start(_: *const u8, _: isize, _: *const *const u8) -> isize {
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0
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}
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fn ice() {
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// Use add
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let r = 5;
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let a = 6;
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r + a; //~ ERROR cannot add
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// Use drop in place
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my_ptr_drop();
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// Use index
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let arr = [0; 5];
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let _ = arr[2];
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// Use phantomdata
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let _ = MyPhantomData::<(), i32>;
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// Use Foo
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let _: () = Foo;
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}
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// use `start`
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fn main() {}
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