warning: any use of this value will cause an error --> $DIR/conditional_array_execution.rs:7:19 | LL | const FOO: u32 = [X - Y, Y - X][(X < Y) as usize]; | -------------- ^^^^^ attempt to compute `5_u32 - 6_u32`, which would overflow | note: the lint level is defined here --> $DIR/conditional_array_execution.rs:3:9 | LL | #![warn(const_err)] | ^^^^^^^^^ = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #71800 error[E0080]: evaluation of constant value failed --> $DIR/conditional_array_execution.rs:12:20 | LL | println!("{}", FOO); | ^^^ referenced constant has errors warning: erroneous constant used --> $DIR/conditional_array_execution.rs:12:20 | LL | println!("{}", FOO); | ^^^ referenced constant has errors | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #71800 = note: this warning originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to previous error; 2 warnings emitted For more information about this error, try `rustc --explain E0080`. Future incompatibility report: Future breakage diagnostic: warning: any use of this value will cause an error --> $DIR/conditional_array_execution.rs:7:19 | LL | const FOO: u32 = [X - Y, Y - X][(X < Y) as usize]; | -------------- ^^^^^ attempt to compute `5_u32 - 6_u32`, which would overflow | note: the lint level is defined here --> $DIR/conditional_array_execution.rs:3:9 | LL | #![warn(const_err)] | ^^^^^^^^^ = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #71800 Future breakage diagnostic: warning: erroneous constant used --> $DIR/conditional_array_execution.rs:12:20 | LL | println!("{}", FOO); | ^^^ referenced constant has errors | note: the lint level is defined here --> $DIR/conditional_array_execution.rs:3:9 | LL | #![warn(const_err)] | ^^^^^^^^^ = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #71800 = note: this warning originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)