#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Never {}
In hindsight, an empty enum acts similar to the !
type. If this is true, then we could use it as the never type and reserve the !
symbol for other purposes.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Never {}
In hindsight, an empty enum acts similar to the !
type. If this is true, then we could use it as the never type and reserve the !
symbol for other purposes.
!
can already be used in function return types on stable.
The builtin !
type also has interesting coercion rules, which is part of the concern about stabilizing it.
Indeed. And Infallible in std::convert - Rust is the canonical version of such that's stable in the library today.
The road to stabilizing !
as a type is still on-going. There's a plan to have a new meeting about it soon™.
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