mirror of https://github.com/rust-lang/rust
47 lines
1.1 KiB
Rust
47 lines
1.1 KiB
Rust
#![feature(const_eval_select)]
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#![feature(core_intrinsics)]
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use std::intrinsics::const_eval_select;
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const fn not_fn_items() {
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const_eval_select((), || {}, || {});
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//~^ ERROR this argument must be a function item
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//~| ERROR this argument must be a function item
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const_eval_select((), 42, 0xDEADBEEF);
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//~^ ERROR expected a `FnOnce()` closure
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//~| ERROR expected a `FnOnce()` closure
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//~| ERROR this argument must be a function item
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//~| ERROR this argument must be a function item
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}
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const fn foo(n: i32) -> i32 {
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n
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}
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fn bar(n: i32) -> bool {
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assert_eq!(n, 0, "{} must be equal to {}", n, 0);
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n == 0
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}
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fn baz(n: bool) -> i32 {
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assert!(n, "{} must be true", n);
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n as i32
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}
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const fn return_ty_mismatch() {
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const_eval_select((1,), foo, bar);
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//~^ ERROR expected `bar` to be a fn item that returns `i32`, but it returns `bool`
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}
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const fn args_ty_mismatch() {
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const_eval_select((true,), foo, baz);
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//~^ ERROR type mismatch
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}
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const fn non_const_fn() {
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const_eval_select((1,), bar, bar);
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//~^ ERROR this argument must be a `const fn`
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}
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fn main() {}
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