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add test for unused erroneous const in CTFE
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RalfJung committed Aug 10, 2020
1 parent 1fa7203 commit fd3851a
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20 changes: 20 additions & 0 deletions src/test/ui/consts/const-eval/erroneous-const.rs
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//! Make sure we error on erroneous consts even if they are unused.
#![warn(const_err, unconditional_panic)]

struct PrintName<T>(T);
impl<T> PrintName<T> {
const VOID: () = [()][2]; //~WARN any use of this value will cause an error
//~^ WARN this operation will panic at runtime
}

const fn no_codegen<T>() {
if false { //~ERROR evaluation of constant value failed
let _ = PrintName::<T>::VOID;
}
}

pub static FOO: () = no_codegen::<i32>(); //~ERROR could not evaluate static initializer

fn main() {
FOO
}
43 changes: 43 additions & 0 deletions src/test/ui/consts/const-eval/erroneous-const.stderr
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warning: this operation will panic at runtime
--> $DIR/erroneous-const.rs:6:22
|
LL | const VOID: () = [()][2];
| ^^^^^^^ index out of bounds: the len is 1 but the index is 2
|
note: the lint level is defined here
--> $DIR/erroneous-const.rs:2:20
|
LL | #![warn(const_err, unconditional_panic)]
| ^^^^^^^^^^^^^^^^^^^

warning: any use of this value will cause an error
--> $DIR/erroneous-const.rs:6:22
|
LL | const VOID: () = [()][2];
| -----------------^^^^^^^-
| |
| index out of bounds: the len is 1 but the index is 2
|
note: the lint level is defined here
--> $DIR/erroneous-const.rs:2:9
|
LL | #![warn(const_err, unconditional_panic)]
| ^^^^^^^^^

error[E0080]: evaluation of constant value failed
--> $DIR/erroneous-const.rs:11:5
|
LL | / if false {
LL | | let _ = PrintName::<T>::VOID;
LL | | }
| |_____^ referenced constant has errors

error[E0080]: could not evaluate static initializer
--> $DIR/erroneous-const.rs:16:22
|
LL | pub static FOO: () = no_codegen::<i32>();
| ^^^^^^^^^^^^^^^^^^^ referenced constant has errors

error: aborting due to 2 previous errors; 2 warnings emitted

For more information about this error, try `rustc --explain E0080`.

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