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|
#![feature(cfg_select)]
#![crate_type = "lib"]
fn print() {
println!(cfg_select! {
unix => { "unix" }
_ => { "not unix" }
});
}
fn print_2() {
println!(cfg_select! {
unix => "unix",
_ => "not unix",
});
}
fn arm_rhs_expr_1() -> i32 {
cfg_select! {
true => 1
}
}
fn arm_rhs_expr_2() -> i32 {
cfg_select! {
true => 1,
false => 2
}
}
fn arm_rhs_expr_3() -> i32 {
cfg_select! {
true => 1,
false => 2,
true => { 42 }
false => -1 as i32,
true => 2 + 2,
false => "",
true => if true { 42 } else { 84 }
false => if true { 42 } else { 84 },
true => return 42,
false => loop {}
true => (1, 2),
false => (1, 2,),
true => todo!(),
false => println!("hello"),
}
}
cfg_select! {
_ => {}
true => {}
//~^ WARN unreachable predicate
}
cfg_select! {
//~^ ERROR none of the predicates in this `cfg_select` evaluated to true
false => {}
}
cfg_select! {}
//~^ ERROR none of the predicates in this `cfg_select` evaluated to true
|
