23 lines
664 B
Rust
23 lines
664 B
Rust
// Checks that const expressions have a useful note explaining why they can't be evaluated.
|
|
// The note should relate to the fact that it cannot be shown forall N that it maps 1-1 to a new
|
|
// type.
|
|
|
|
//@ revisions: full min
|
|
#![cfg_attr(full, feature(generic_const_exprs))]
|
|
#![cfg_attr(full, allow(incomplete_features))]
|
|
|
|
struct Collatz<const N: Option<usize>>;
|
|
//~^ ERROR: `Option<usize>` is forbidden
|
|
|
|
impl <const N: usize> Collatz<{Some(N)}> {}
|
|
//~^ ERROR the const parameter
|
|
//[min]~^^ generic parameters may not be used in const operations
|
|
//[full]~^^^ ERROR overly complex
|
|
|
|
struct Foo;
|
|
|
|
impl<const N: usize> Foo {}
|
|
//~^ ERROR the const parameter
|
|
|
|
fn main() {}
|