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#![feature(coverage_attribute)]
//@ edition: 2024
//@ compile-flags: -Zcoverage-options=branch
//@ llvm-cov-flags: --show-branches=count
macro_rules! no_merge {
() => {
for _ in 0..1 {}
};
}
fn if_let(input: Option<&str>) {
no_merge!();
if let Some(x) = input {
say(x);
} else {
say("none");
}
say("done");
}
fn if_let_chain(a: Option<&str>, b: Option<&str>) {
if let Some(x) = a
&& let Some(y) = b
{
say(x);
say(y);
} else {
say("not both");
}
say("done");
}
#[coverage(off)]
fn say(message: &str) {
core::hint::black_box(message);
}
#[coverage(off)]
fn main() {
if_let(Some("x"));
if_let(Some("x"));
if_let(None);
for _ in 0..8 {
if_let_chain(Some("a"), Some("b"));
}
for _ in 0..4 {
if_let_chain(Some("a"), None);
}
for _ in 0..2 {
if_let_chain(None, Some("b"));
}
if_let_chain(None, None);
}
// FIXME(#124118) Actually instrument if-let and let-chains for branch coverage.
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