rust/tests/coverage/partial_eq.rs
Zalathar 9dc6e08279 Manually run x fmt on all source files in tests/coverage/
Currently we can't automatically enforce formatting on tests (see #125637), but
we can at least keep things relatively tidy by occasionally running the
formatter manually.

This was done by temporarily commenting out the `"/tests/"` exclusion in
`rustfmt.toml`, and then running `x fmt tests/coverage` and
`x test coverage --bless`.
2024-05-29 14:34:17 +10:00

48 lines
1.4 KiB
Rust

// This test confirms an earlier problem was resolved, supporting the MIR graph generated by the
// structure of this test.
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Version {
major: usize,
minor: usize,
patch: usize,
}
impl Version {
pub fn new(major: usize, minor: usize, patch: usize) -> Self {
Self { major, minor, patch }
}
}
fn main() {
let version_3_2_1 = Version::new(3, 2, 1);
let version_3_3_0 = Version::new(3, 3, 0);
println!(
"{:?} < {:?} = {}",
version_3_2_1,
version_3_3_0,
version_3_2_1 < version_3_3_0, //
);
}
/*
This test verifies a bug was fixed that otherwise generated this error:
thread 'rustc' panicked at 'No counters provided the source_hash for function:
Instance {
def: Item(WithOptConstParam {
did: DefId(0:101 ~ autocfg[c44a]::version::{impl#2}::partial_cmp),
const_param_did: None
}),
args: []
}'
The `PartialOrd` derived by `Version` happened to generate a MIR that generated coverage
without a code region associated with any `Counter`. Code regions were associated with at least
one expression, which is allowed, but the `function_source_hash` was only passed to the codegen
(coverage mapgen) phase from a `Counter`s code region. A new method was added to pass the
`function_source_hash` without a code region, if necessary.
*/