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