more usable minimizer output?

[Gankra]

When a test fails in the check step (so the test compiled and ran, but we didn't like the result we got out), we do a second pass, minimizing all the failures:

abi-cafe/src/main.rs

Lines 242 to 253 in 6ba6865

	fn generate_minimized_failures(
	cfg: &Config,
	harness: &Arc<TestHarness>,
	rt: &tokio::runtime::Runtime,
	reports: &FullReport,
	) {
	info!("rerunning failures");
	let tasks = reports.tests.iter().flat_map(|report| {
	let Some(check) = report.results.check.as_ref() else {
	return vec![];
	};
	check

As a side-effect of building them we'll print out their paths, but we don't produce any summary:

abi-cafe/src/main.rs

Lines 306 to 309 in 6ba6865

	let _results = tasks
	.into_iter()
	.map(|task| rt.block_on(task).expect("failed to join task"))
	.collect::<Vec<_>>();

We also, more importantly to me, don't actually produce a fully usable reproduction, we only produce two source files, and it's your problem to make use of them. In an ideal world we would generate a cargo and/or (C?)Make project you could build and run.

To that end at one point I tossed a "main.rs" in the harness includes, but I never sorted out the details. Honestly not sure what would be useful to people reporting/receiving bug reports.

abi-cafe/include/harness/main.rs

Lines 1 to 17 in 6ba6865

	//! This is the primary file for the abi-cafe standalone binary/project mode.
	//!
	//! This mode is primarily intended for reporting/debugging abi-cafe test failures,
	//! where you want the particulars of abi-cafe to go away, and want a minimized
	//! reproduction of the issue.
	//!
	//! As such this is incompatible with `WriteImpl::HarnessCallback`.
	//!
	//! In theory this could be replaced with just making `caller::do_test` into `main`
	//! but this might be a bit easier..?
	extern {
	fn do_test();
	}
	fn main() {
	do_test();
	}

[Gankra]

I'm not sure if this can be part of abi-cafe proper but I would like the test failures to be easy to hang off of a github CI task as an artifacts zip