src/test/ui/rfc-2008-non-exhaustive/uninhabited/indirect_match_with_exhaustive_patterns_same_crate.rs

   1 // check-pass
   2
   3 #![deny(unreachable_patterns)]
   4 #![feature(exhaustive_patterns)]
   5 #![feature(never_type)]
   6 #![feature(non_exhaustive)]
   7
   8 #[non_exhaustive]
   9 pub enum UninhabitedEnum {
  10 }
  11
  12 #[non_exhaustive]
  13 pub struct UninhabitedStruct {
  14     _priv: !,
  15 }
  16
  17 #[non_exhaustive]
  18 pub struct UninhabitedTupleStruct(!);
  19
  20 pub enum UninhabitedVariants {
  21     #[non_exhaustive] Tuple(!),
  22     #[non_exhaustive] Struct { x: ! }
  23 }
  24
  25 pub struct IndirectUninhabitedEnum(UninhabitedEnum);
  26
  27 pub struct IndirectUninhabitedStruct(UninhabitedStruct);
  28
  29 pub struct IndirectUninhabitedTupleStruct(UninhabitedTupleStruct);
  30
  31 pub struct IndirectUninhabitedVariants(UninhabitedVariants);
  32
  33 struct A;
  34
  35 // This test checks that an empty match on a non-exhaustive uninhabited type from the defining crate
  36 // will compile. In particular, this enables the `exhaustive_patterns` feature as this can
  37 // change the branch used in the compiler to determine this.
  38 // Codegen is skipped because tests with long names can cause issues on Windows CI, see #60648.
  39
  40 fn cannot_empty_match_on_empty_enum_to_anything(x: IndirectUninhabitedEnum) -> A {
  41     match x {}
  42 }
  43
  44 fn cannot_empty_match_on_empty_struct_to_anything(x: IndirectUninhabitedStruct) -> A {
  45     match x {}
  46 }
  47
  48 fn cannot_empty_match_on_empty_tuple_struct_to_anything(x: IndirectUninhabitedTupleStruct) -> A {
  49     match x {}
  50 }
  51
  52 fn cannot_empty_match_on_enum_with_empty_variants_struct_to_anything(
  53     x: IndirectUninhabitedVariants,
  54 ) -> A {
  55     match x {}
  56 }
  57
  58 fn main() {}