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#![deny(unreachable_patterns)]
#![feature(exhaustive_patterns)]
#![feature(never_type)]
#[non_exhaustive]
pub enum UninhabitedEnum {
}
#[non_exhaustive]
pub struct UninhabitedTupleStruct(!);
#[non_exhaustive]
pub struct UninhabitedStruct {
_priv: !,
}
pub enum UninhabitedVariants {
#[non_exhaustive] Tuple(!),
#[non_exhaustive] Struct { x: ! }
}
pub enum PartiallyInhabitedVariants {
Tuple(u8),
#[non_exhaustive] Struct { x: ! }
}
fn uninhabited_enum() -> Option<UninhabitedEnum> {
None
}
fn uninhabited_variant() -> Option<UninhabitedVariants> {
None
}
fn partially_inhabited_variant() -> PartiallyInhabitedVariants {
PartiallyInhabitedVariants::Tuple(3)
}
fn uninhabited_struct() -> Option<UninhabitedStruct> {
None
}
fn uninhabited_tuple_struct() -> Option<UninhabitedTupleStruct> {
None
}
// This test checks that non-exhaustive types that would normally be considered uninhabited within
// the defining crate are still considered uninhabited.
fn main() {
match uninhabited_enum() {
Some(_x) => (), //~ ERROR unreachable pattern
None => (),
}
match uninhabited_variant() {
Some(_x) => (), //~ ERROR unreachable pattern
None => (),
}
while let PartiallyInhabitedVariants::Struct { x } = partially_inhabited_variant() {
//~^ ERROR unreachable pattern
}
while let Some(_x) = uninhabited_struct() { //~ ERROR unreachable pattern
}
while let Some(_x) = uninhabited_tuple_struct() { //~ ERROR unreachable pattern
}
}
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