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// revisions: noopt opt opt_with_overflow_checks
//[noopt]compile-flags: -C opt-level=0
//[opt]compile-flags: -O
//[opt_with_overflow_checks]compile-flags: -C overflow-checks=on -O
// build-pass
// ignore-pass (test emits codegen-time warnings and verifies that they are not errors)
//! This test ensures that when we promote code that fails to evaluate, the build still succeeds.
#![warn(const_err, arithmetic_overflow, unconditional_panic)]
// The only way to have promoteds that fail is in `const fn` called from `const`/`static`.
const fn overflow() -> u32 {
0 - 1
//[opt_with_overflow_checks,noopt]~^ WARN any use of this value will cause an error
//[opt_with_overflow_checks,noopt]~| WARN this was previously accepted by the compiler
//~^^^ WARN this arithmetic operation will overflow
}
const fn div_by_zero1() -> i32 {
1 / 0
//[opt]~^ WARN any use of this value will cause an error
//[opt]~| WARN this was previously accepted by the compiler but is being phased out
//~^^^ WARN this operation will panic at runtime
}
const fn div_by_zero2() -> i32 {
1 / (1 - 1)
//~^ WARN this operation will panic at runtime
}
const fn div_by_zero3() -> i32 {
1 / (false as i32)
//~^ WARN this operation will panic at runtime
}
const fn oob() -> i32 {
[1, 2, 3][4]
//~^ WARN this operation will panic at runtime
}
// An unused constant containing failing promoteds.
// This should work as long as `const_err` can be turned into just a warning;
// once it turns into a hard error, just remove `X`.
const X: () = {
let _x: &'static u32 = &overflow();
//[opt_with_overflow_checks,noopt]~^ WARN any use of this value will cause an error
//[opt_with_overflow_checks,noopt]~| WARN this was previously accepted by the compiler
let _x: &'static i32 = &div_by_zero1();
//[opt]~^ WARN any use of this value will cause an error
//[opt]~| WARN this was previously accepted by the compiler but is being phased out
let _x: &'static i32 = &div_by_zero2();
let _x: &'static i32 = &div_by_zero3();
let _x: &'static i32 = &oob();
};
const fn mk_false() -> bool { false }
// An actually used constant referencing failing promoteds in dead code.
// This needs to always work.
const Y: () = {
if mk_false() {
let _x: &'static u32 = &overflow();
let _x: &'static i32 = &div_by_zero1();
let _x: &'static i32 = &div_by_zero2();
let _x: &'static i32 = &div_by_zero3();
let _x: &'static i32 = &oob();
}
()
};
fn main() {
let _y = Y;
}
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