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tests: Add tests that use const fns.

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davidtwco committed Jun 13, 2019
1 parent 09da06e commit 8168d22658fb90d4ef96000c17d01d55811c498b
@@ -0,0 +1,26 @@
// ignore-tidy-linelength
// ignore-compare-mode-nll
#![feature(const_in_array_repeat_expressions, nll)]
#![allow(warnings)]

// Some type that is not copyable.
struct Bar;

const fn type_no_copy() -> Option<Bar> {
None
}

const fn type_copy() -> u32 {
3
}

fn no_copy() {
const ARR: [Option<Bar>; 2] = [type_no_copy(); 2];
//~^ ERROR the trait bound `std::option::Option<Bar>: std::marker::Copy` is not satisfied [E0277]
}

fn copy() {
const ARR: [u32; 2] = [type_copy(); 2];
}

fn main() {}
@@ -0,0 +1,13 @@
error[E0277]: the trait bound `std::option::Option<Bar>: std::marker::Copy` is not satisfied
--> $DIR/const-fns.rs:18:35
|
LL | const ARR: [Option<Bar>; 2] = [type_no_copy(); 2];
| ^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Copy` is not implemented for `std::option::Option<Bar>`
|
= help: the following implementations were found:
<std::option::Option<T> as std::marker::Copy>
= note: the `Copy` trait is required because the repeated element will be copied

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.

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