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rust/tests/coverage/issue-83601.rs

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Derived Eq no longer shows uncovered The Eq trait has a special hidden function. MIR `InstrumentCoverage` would add this function to the coverage map, but it is never called, so the `Eq` trait would always appear uncovered. Fixes: #83601 The fix required creating a new function attribute `no_coverage` to mark functions that should be ignored by `InstrumentCoverage` and the coverage `mapgen` (during codegen). While testing, I also noticed two other issues: * spanview debug file output ICEd on a function with no body. The workaround for this is included in this PR. * `assert_*!()` macro coverage can appear covered if followed by another `assert_*!()` macro. Normally they appear uncovered. I submitted a new Issue #84561, and added a coverage test to demonstrate this issue.
2021-04-25 13:34:03 -07:00
// Shows that rust-lang/rust/83601 is resolved
#[derive(Debug, PartialEq, Eq)]
struct Foo(u32);
fn main() {
let bar = Foo(1);
assert_eq!(bar, Foo(1));
let baz = Foo(0);
assert_ne!(baz, Foo(1));
println!("{:?}", Foo(1));
println!("{:?}", bar);
println!("{:?}", baz);
}
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