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Rollup merge of #80696 - RalfJung:failing-promoteds, r=oli-obk

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make sure that promoteds which fail to evaluate in dead const code behave correctly

https://github.com/rust-lang/rust/pull/80243 showed that we'll have to live with these kinds of failing promoteds for a while, so let's make sure we have a test that covers them.
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Yuki Okushi 2021-01-05 09:52:52 +09:00 committed by GitHub
commit 9daac58ee9
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1 changed files with 13 additions and 2 deletions
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15
src/test/ui/consts/promotion.rs
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@ -4,12 +4,23 @@
fn foo(_: &'static [&'static str]) {}
fn bar(_: &'static [&'static str; 3]) {}
fn baz_i32(_: &'static i32) {}
fn baz_u32(_: &'static u32) {}
const fn baz_i32(_: &'static i32) {}
const fn baz_u32(_: &'static u32) {}
const fn fail() -> i32 { 1/0 }
const C: i32 = {
// Promoted that fails to evaluate in dead code -- this must work
// (for backwards compatibility reasons).
if false {
baz_i32(&fail());
}
42
};
fn main() {
foo(&["a", "b", "c"]);
bar(&["d", "e", "f"]);
assert_eq!(C, 42);
// make sure that these do not cause trouble despite overflowing
baz_u32(&(0-1));