Windows-specific issue with <settings>

[aalleexxeeii]

In some unclear cases, when running on Windows, compilation raises strange exceptions like this:

Exception in thread "main" com.eed3si9n.eval.EvalException: an error in expression: class dotty.tools.dotc.reporting.Diagnostic$Error at ?: invalid file path: Illegal char <<> at index 0: <setting>
	at com.eed3si9n.eval.Eval.checkError(Eval.scala:259)
	at com.eed3si9n.eval.Eval.compileAndLoad(Eval.scala:224)
	at com.eed3si9n.eval.Eval.evalCommon(Eval.scala:203)
	at com.eed3si9n.eval.Eval.eval(Eval.scala:119)
	at com.eed3si9n.eval.Eval.evalInfer(Eval.scala:71)

It looks like this is due to using <settings> as a fake file name where < is an invalid character for a filename on Windows.

I have attached a sample project to reproduce the issue:

eval-test.zip

[eed3si9n]

Thanks for taking time to report this!

[eed3si9n]

As a prep step, here's a PR to enable CI on Linux, macOS, and Windows - #16

[eed3si9n]

I feel like this is more of a Scala 3 bug - scala/scala3#23057