This subproject is used as part of the test-suite.
It contains example Java classes so we can compare its bytecode with that generated by the equivalent
Feather scrips.
I wanted these classes written in Java, to avoid complications caused by Kotlin's additional features.
I don't want projects with a mixture of Kotlin and Java (this has caused me problems in the past),
so I can't place them in feather2-core:test.
The @Test function which use these classes should state that in their dokka comments.
This lets us jump from the @Test to the Java class (F4 when the caret is in the appropriate comment),
and from the Java class to the @Test functions using Find Usages (Alt+Shift+F7).