46 lines
970 B
Rust
46 lines
970 B
Rust
#![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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struct A;
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// This test checks that uninhabited non-exhaustive types defined in the same crate cannot coerce
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// to any type, as the never type can.
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fn can_coerce_never_type_to_anything(x: !) -> A {
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x
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}
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fn cannot_coerce_empty_enum_to_anything(x: UninhabitedEnum) -> A {
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x //~ ERROR mismatched types
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}
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fn cannot_coerce_empty_tuple_struct_to_anything(x: UninhabitedTupleStruct) -> A {
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x //~ ERROR mismatched types
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}
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fn cannot_coerce_empty_struct_to_anything(x: UninhabitedStruct) -> A {
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x //~ ERROR mismatched types
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}
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fn cannot_coerce_enum_with_empty_variants_to_anything(x: UninhabitedVariants) -> A {
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x //~ ERROR mismatched types
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}
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fn main() {}
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