| #![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 |