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// Tests that `as` casts from enums to numeric types succeed
// only if the enum type is "unit-only" or "fieldless" as
// described here: https://doc.rust-lang.org/reference/items/enumerations.html#casting
pub enum UnitOnly {
Foo,
Bar,
Baz,
}
pub enum Fieldless {
Tuple(),
Struct{},
Unit,
}
pub enum NotUnitOnlyOrFieldless {
Foo,
Bar(u8),
Baz
}
fn main() {
let unit_only = UnitOnly::Foo;
let _ = unit_only as isize;
let _ = unit_only as i32;
let _ = unit_only as usize;
let _ = unit_only as u32;
let fieldless = Fieldless::Struct{};
let _ = fieldless as isize;
let _ = fieldless as i32;
let _ = fieldless as usize;
let _ = fieldless as u32;
let not_unit_only_or_fieldless = NotUnitOnlyOrFieldless::Foo;
let _ = not_unit_only_or_fieldless as isize; //~ ERROR non-primitive cast: `NotUnitOnlyOrFieldless` as `isize`
let _ = not_unit_only_or_fieldless as i32; //~ ERROR non-primitive cast: `NotUnitOnlyOrFieldless` as `i32`
let _ = not_unit_only_or_fieldless as usize; //~ ERROR non-primitive cast: `NotUnitOnlyOrFieldless` as `usize`
let _ = not_unit_only_or_fieldless as u32; //~ ERROR non-primitive cast: `NotUnitOnlyOrFieldless` as `u32`
}
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