0.8.0 regression - automatic derivation compilation error

This compiled fine in 0.7.2:

import scala.concurrent.duration.FiniteDuration

case class A(a: Int,
             b: Double,
             c: FiniteDuration,
             d: Int,
             e: Int,
             f: Int,
             g: FiniteDuration,
             h: FiniteDuration,
             i: Map[String, Int],
             j: B,
             k: E,
             l: F,
             m: L,
             n: O,
             o: R,
             p: P)

case class B(a: D, b: C)

case class C(a: Int)

case class D(a: Int)

case class E(a: String, b: Int)

case class F(a: String, b: G, c: H, d: I)

case class G(a: Int)

case class H(a: Int, b: Map[String, String])

case class I(a: Int,
             b: J,
             c: K,
             d: Map[String, String])

case class J(a: Int)

case class K(a: String,
             b: FiniteDuration)

case class L(a: String,
             b: String,
             c: String,
             d: String,
             e: Map[String, String],
             f: Option[M])

case class M(a: Boolean, b: String, c: N)

case class N(a: String, b: String, c: String)

case class O(a: String, b: Int, c: Int, d: FiniteDuration)

case class P(a: Q, b: O)

case class Q(a: String)

case class R(a: L)

Now with 0.8.0 it fails intermitently, first compilation fails, subsequent compilations succeed:

[error]      could not find implicit value for parameter reader: pureconfig.ConfigReader[A]
[error]      L28:    pureconfig.loadConfig[A](configObject)

[ruippeixotog]

Ok, thanks for the effort in reproducing this! The Scala compiler seems to be lacking the resources to do a derivation that complex. Try running the last command as SBT_OPTS="-Xms512m -Xmx1536m -Xss2m" /sbt/bin/sbt compile and see that it now compiles successfully.

I was not being able to reproduce it locally because I use the sbt-extras script for launching SBT, which provides way more reasonable defaults. I totally recommend it.

[aserrallerios]

You’re my hero!