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fix validating arrays of ZSTs

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Fixes #54751
This commit is contained in:
Ralf Jung 2018-10-02 19:17:30 +02:00
parent f65d3b5491
commit 0a2fae6cb7
4 changed files with 43 additions and 19 deletions
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15
src/test/ui/consts/const-eval/ub-uninhabit.rs
View file

@ -8,19 +8,20 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
union Foo {
a: usize,
b: Bar,
c: &'static Bar,
}
#![feature(const_transmute)]
use std::mem;
#[derive(Copy, Clone)]
enum Bar {}
const BAD_BAD_BAD: Bar = unsafe { Foo { a: 1 }.b };
const BAD_BAD_BAD: Bar = unsafe { mem::transmute(()) };
//~^ ERROR this constant likely exhibits undefined behavior
const BAD_BAD_REF: &Bar = unsafe { Foo { a: 1 }.c };
const BAD_BAD_REF: &Bar = unsafe { mem::transmute(1usize) };
//~^ ERROR this constant likely exhibits undefined behavior
const BAD_BAD_ARRAY: [Bar; 1] = unsafe { mem::transmute(()) };
//~^ ERROR this constant likely exhibits undefined behavior
fn main() {

22
src/test/ui/consts/const-eval/ub-uninhabit.stderr
View file

@ -1,19 +1,27 @@
error[E0080]: this constant likely exhibits undefined behavior
--> $DIR/ub-uninhabit.rs:20:1
--> $DIR/ub-uninhabit.rs:18:1
|
LL | const BAD_BAD_BAD: Bar = unsafe { Foo { a: 1 }.b };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a value of an uninhabited type
LL | const BAD_BAD_BAD: Bar = unsafe { mem::transmute(()) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a value of an uninhabited type
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rust compiler repository if you believe it should not be considered undefined behavior
error[E0080]: this constant likely exhibits undefined behavior
--> $DIR/ub-uninhabit.rs:23:1
--> $DIR/ub-uninhabit.rs:21:1
|
LL | const BAD_BAD_REF: &Bar = unsafe { Foo { a: 1 }.c };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a value of an uninhabited type at .<deref>
LL | const BAD_BAD_REF: &Bar = unsafe { mem::transmute(1usize) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a value of an uninhabited type at .<deref>
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rust compiler repository if you believe it should not be considered undefined behavior
error: aborting due to 2 previous errors
error[E0080]: this constant likely exhibits undefined behavior
--> $DIR/ub-uninhabit.rs:24:1
|
LL | const BAD_BAD_ARRAY: [Bar; 1] = unsafe { mem::transmute(()) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a value of an uninhabited type at [0]
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rust compiler repository if you believe it should not be considered undefined behavior
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0080`.