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The output of these tests is too complicated to comfortably verify by hand, but we can still use them to observe changes to the underlying mappings produced by codegen/LLVM. If these tests fail due to non-coverage changes (e.g. in HIR-to-MIR lowering or MIR optimizations), it should usually be OK to just `--bless` them, as long as the `run-coverage` test suite still works.
33 lines
1.3 KiB
Rust
33 lines
1.3 KiB
Rust
#![allow(unused_assignments)]
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// failure-status: 101
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fn might_fail_assert(one_plus_one: u32) {
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println!("does 1 + 1 = {}?", one_plus_one);
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assert_eq!(1 + 1, one_plus_one, "the argument was wrong");
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}
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fn main() -> Result<(), u8> {
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let mut countdown = 10;
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while countdown > 0 {
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if countdown == 1 {
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might_fail_assert(3);
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} else if countdown < 5 {
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might_fail_assert(2);
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}
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countdown -= 1;
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}
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Ok(())
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}
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// Notes:
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// 1. Compare this program and its coverage results to those of the very similar test
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// `panic_unwind.rs`, and similar tests `abort.rs` and `try_error_result.rs`.
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// 2. This test confirms the coverage generated when a program passes or fails an `assert!()` or
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// related `assert_*!()` macro.
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// 3. Notably, the `assert` macros *do not* generate `TerminatorKind::Assert`. The macros produce
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// conditional expressions, `TerminatorKind::SwitchInt` branches, and a possible call to
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// `begin_panic_fmt()` (that begins a panic unwind, if the assertion test fails).
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// 4. `TerminatoKind::Assert` is, however, also present in the MIR generated for this test
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// (and in many other coverage tests). The `Assert` terminator is typically generated by the
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// Rust compiler to check for runtime failures, such as numeric overflows.
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