| LL| |#![feature(coverage_attribute)] | |
| LL| |//@ edition: 2021 | |
| LL| |//@ compile-flags: -Zcoverage-options=branch | |
| LL| |//@ llvm-cov-flags: --show-branches=count | |
| LL| | | |
| LL| |// When instrumenting match expressions for branch coverage, make sure we don't | |
| LL| |// cause an ICE or produce weird coverage output for matches with <2 arms. | |
| LL| | | |
| LL| |// Helper macro to prevent start-of-function spans from being merged into | |
| LL| |// spans on the lines we care about. | |
| LL| |macro_rules! no_merge { | |
| LL| | () => { | |
| LL| | for _ in 0..1 {} | |
| LL| | }; | |
| LL| |} | |
| LL| | | |
| LL| |enum Uninhabited {} | |
| LL| |enum Trivial { | |
| LL| | Value, | |
| LL| |} | |
| LL| | | |
| LL| 0|fn _uninhabited(x: Uninhabited) { | |
| LL| 0| no_merge!(); | |
| LL| | | |
| LL| | match x {} | |
| LL| | | |
| LL| | consume("done"); | |
| LL| |} | |
| LL| | | |
| LL| 1|fn trivial(x: Trivial) { | |
| LL| 1| no_merge!(); | |
| LL| | | |
| LL| 1| match x { | |
| LL| 1| Trivial::Value => consume("trivial"), | |
| LL| 1| } | |
| LL| 1| | |
| LL| 1| consume("done"); | |
| LL| 1|} | |
| LL| | | |
| LL| |#[coverage(off)] | |
| LL| |fn consume<T>(x: T) { | |
| LL| | core::hint::black_box(x); | |
| LL| |} | |
| LL| | | |
| LL| |#[coverage(off)] | |
| LL| |fn main() { | |
| LL| | trivial(Trivial::Value); | |
| LL| |} | |