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