mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 08:13:41 +00:00
33 lines
1.3 KiB
Rust
33 lines
1.3 KiB
Rust
#![allow(unused_assignments)]
|
|
// failure-status: 101
|
|
|
|
fn might_fail_assert(one_plus_one: u32) {
|
|
println!("does 1 + 1 = {}?", one_plus_one);
|
|
assert_eq!(1 + 1, one_plus_one, "the argument was wrong");
|
|
}
|
|
|
|
fn main() -> Result<(), u8> {
|
|
let mut countdown = 10;
|
|
while countdown > 0 {
|
|
if countdown == 1 {
|
|
might_fail_assert(3);
|
|
} else if countdown < 5 {
|
|
might_fail_assert(2);
|
|
}
|
|
countdown -= 1;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
// Notes:
|
|
// 1. Compare this program and its coverage results to those of the very similar test
|
|
// `panic_unwind.rs`, and similar tests `abort.rs` and `try_error_result.rs`.
|
|
// 2. This test confirms the coverage generated when a program passes or fails an `assert!()` or
|
|
// related `assert_*!()` macro.
|
|
// 3. Notably, the `assert` macros *do not* generate `TerminatorKind::Assert`. The macros produce
|
|
// conditional expressions, `TerminatorKind::SwitchInt` branches, and a possible call to
|
|
// `begin_panic_fmt()` (that begins a panic unwind, if the assertion test fails).
|
|
// 4. `TerminatoKind::Assert` is, however, also present in the MIR generated for this test
|
|
// (and in many other coverage tests). The `Assert` terminator is typically generated by the
|
|
// Rust compiler to check for runtime failures, such as numeric overflows.
|