mirror of https://github.com/rust-lang/rust
50 lines
1.7 KiB
Rust
50 lines
1.7 KiB
Rust
fn main() {
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let u = 5 as bool; //~ ERROR cannot cast `i32` as `bool`
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//~| HELP compare with zero instead
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//~| SUGGESTION != 0
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let t = (1 + 2) as bool; //~ ERROR cannot cast `i32` as `bool`
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//~| HELP compare with zero instead
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//~| SUGGESTION != 0
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let _ = 5_u32 as bool; //~ ERROR cannot cast `u32` as `bool`
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//~| HELP compare with zero instead
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let _ = 64.0_f64 as bool; //~ ERROR cannot cast `f64` as `bool`
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//~| HELP compare with zero instead
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// Enums that can normally be cast to integers can't be cast to `bool`, just like integers.
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// Note that enums that cannot be cast to integers can't be cast to anything at *all*
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// so that's not tested here.
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enum IntEnum {
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Zero,
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One,
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Two
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}
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let _ = IntEnum::One as bool; //~ ERROR cannot cast `IntEnum` as `bool`
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fn uwu(_: u8) -> String {
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todo!()
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}
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unsafe fn owo() {}
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// fn item to bool
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let _ = uwu as bool; //~ ERROR cannot cast `fn(u8) -> String {uwu}` as `bool`
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// unsafe fn item
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let _ = owo as bool; //~ ERROR cannot cast `unsafe fn() {owo}` as `bool`
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// fn ptr to bool
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let _ = uwu as fn(u8) -> String as bool; //~ ERROR cannot cast `fn(u8) -> String` as `bool`
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let _ = 'x' as bool; //~ ERROR cannot cast `char` as `bool`
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let ptr = 1 as *const ();
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let _ = ptr as bool; //~ ERROR cannot cast `*const ()` as `bool`
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let v = "hello" as bool;
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//~^ ERROR casting `&'static str` as `bool` is invalid
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//~| HELP consider using the `is_empty` method on `&'static str` to determine if it contains anything
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}
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