Using scoverage with such code may result in the following warning from the plugin:
[warn] Could not instrument [Select/value rec$1].
Originally discovered by using scoverage with the code that derives typeclass instances using kittens library:
case class Bar()
case class Foo(bars: List[Bar])
object Foo {
implicit eq: cats.Eq[Foo] = cats.derived.semiauto.eq
}
Solution:
Ignore LazyDefns$1.rec$1 from instrumentation like other synthetic code
Other changes:
It was necessary to disable position validation phase for the test case that reproduces the issue because the code generated by scala compiler fails such validation. It could be also checked outside testing environment by manually setting -Yvalidate-pos:typer option to the compiler. Not sure whether it's expected compiler behavior or not
Preamble:
by-name implicit parameters used for shapeless magic and were introduced in SIP-31 (available from 2.13+): https://docs.scala-lang.org/sips/byname-implicits.html
Using scoverage with such code may result in the following warning from the plugin:
Originally discovered by using scoverage with the code that derives typeclass instances using kittens library:
Solution:
Ignore
LazyDefns$1.rec$1from instrumentation like other synthetic codeOther changes:
It was necessary to disable position validation phase for the test case that reproduces the issue because the code generated by scala compiler fails such validation. It could be also checked outside testing environment by manually setting
-Yvalidate-pos:typeroption to the compiler. Not sure whether it's expected compiler behavior or not