break outside loop causes compiler assertion

[Simn]

function main() {
	@:coroutine function f() {
		break;
	}
}

Fatal error: exception Failure("hd")
Raised at Stdlib.failwith in file "stdlib.ml", line 29, characters 17-33
Called from Stdlib__List.hd in file "list.ml" (inlined), line 30, characters 10-23
Called from CoroFromTexpr.expr_to_coro.loop in file "src/coro/coroFromTexpr.ml", line 217, characters 44-65
Called from CoroFromTexpr.expr_to_coro.loop_assign in file "src/coro/coroFromTexpr.ml", line 380, characters 11-24

The typer doesn't error hard enough for the coro transformer to not run, and it then gets confused.

[Simn]

@kLabz Do you know if we have a reliable way to tell if our current compilation has had an error? I've found com.has_error, but that is only properly set in diagnostics mode.

[kLabz]

@kLabz Do you know if we have a reliable way to tell if our current compilation has had an error? I've found com.has_error, but that is only properly set in diagnostics mode.

Hmm.

There's also has_error from compilationContext, and messages there that you could filter to look for errors, but that should pretty much do the same with more indirection.

[Simn]

The compilationContext isn't available to the typer, so that's not an option here. I guess we could look into making sure that com.has_error is always properly set. I've fixed the issue itself, but it would be good to entirely skip the coro transformation in the case of errors.