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Diffstat (limited to 'tests/ui/consts/const-eval/promoted_errors.rs')
-rw-r--r-- | tests/ui/consts/const-eval/promoted_errors.rs | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/tests/ui/consts/const-eval/promoted_errors.rs b/tests/ui/consts/const-eval/promoted_errors.rs new file mode 100644 index 000000000..2c42d0356 --- /dev/null +++ b/tests/ui/consts/const-eval/promoted_errors.rs @@ -0,0 +1,52 @@ +// 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(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 + //~^ WARN this arithmetic operation will overflow +} +const fn div_by_zero1() -> i32 { + 1 / 0 + //~^ 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 +} + +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; +} |