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[2373186.386]  -> [email protected]_registry(new id wl_registry@2)
[2373186.403]  -> [email protected](new id wl_callback@3)
[2373186.476] [email protected]_id(3)
[2373186.481] [email protected](1, "wl_shm", 1)
[2373186.488]  -> [email protected](1, "wl_shm", 1, new id [unknown]@4)
[2373186.495] [email protected](2, "zwp_linux_dmabuf_v1", 3)
[2373186.500]  -> [email protected](2, "zwp_linux_dmabuf_v1", 3, new id [unknown]@5)
[2373186.504]  -> [email protected](new id wl_callback@6)
[2373186.506] [email protected](3, "wl_compositor", 4)
[2373186.509]  -> [email protected](3, "wl_compositor", 4, new id [unknown]@7)

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[19315:19315:0120/180446.390531:ERROR:sandbox_linux.cc(374)] InitializeSandbox() called with multiple threads in process gpu-process.
[19276:19276:0120/180446.400579:ERROR:wayland_surface.cc(59)] Server doesn't support zwp_linux_explicit_synchronization_v1.
[19276:19276:0120/180446.566103:ERROR:wayland_surface.cc(59)] Server doesn't support zwp_linux_explicit_synchronization_v1.
[19315:19315:0120/180446.746157:ERROR:gl_surface_egl.cc(774)] EGL Driver message (Error) eglCreateImageKHR: _eglParseImageAttribList
[19315:19315:0120/180446.746279:ERROR:gl_image_egl.cc(37)] Error creating EGLImage: EGL_BAD_PARAMETER
[19315:19315:0120/180446.746442:ERROR:gpu_memory_buffer_factory_native_pixmap.cc(257)] Failed to create GLImage 3810x2880, RGBA_8888, usage SCANOUT
[19315:19315:0120/180446.754903:ERROR:gl_surface_egl.cc(774)] EGL Driver message (Error) eglCreateImageKHR: _eglParseImageAttribList
[19315:19315:0120/180446.755026:ERROR:gl_image_egl.cc(37)] Error creating EGLImage: EGL_BAD_PARAMETER
[19315:19315:0120/180446

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00:00:00.000 [sway/main.c:327] Sway version 1.5-a1591c23 (Dec  9 2020, branch 'master')
00:00:00.002 [sway/main.c:154] Linux ROC01-HYMT373 5.9.13-zen1-1-zen #1 ZEN SMP PREEMPT Tue, 08 Dec 2020 12:10:52 +0000 x86_64 GNU/Linux
00:00:00.002 [sway/main.c:170] Contents of /etc/os-release:
00:00:00.002 [sway/main.c:154] NAME="Arch Linux"
00:00:00.002 [sway/main.c:154] PRETTY_NAME="Arch Linux"
00:00:00.002 [sway/main.c:154] ID=arch
00:00:00.002 [sway/main.c:154] BUILD_ID=rolling
00:00:00.002 [sway/main.c:154] ANSI_COLOR="38;2;23;147;209"
00:00:00.002 [sway/main.c:154] HOME_URL="https://www.archlinux.org/"
00:00:00.002 [sway/main.c:154] DOCUMENTATION_URL="https://wiki.archlinux.org/"

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package testing

import shapeless.labelled.FieldType
import shapeless.{:+:, CNil, Coproduct, HNil, Inl, Inr, LabelledGeneric, Lazy, Witness, labelled}

trait EnumCodec[T] {
  def encode: T => String
  def decode: String => Option[T]
}

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package testing

import org.scalatest.FunSuite
import shapeless.labelled.FieldType
import shapeless.{:+:, CNil, Coproduct, Generic, HNil, Inl, Inr, LabelledGeneric, Lazy, Witness}

trait EnumCodec[T] {
  def encode: T => String
  def decode: String => Option[T]
}

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import cats._
import cats.data._
import cats.implicits._

case class User(age: Int)

// notice F: FlatMap; fetchUser returning G[F[User]], and the use of flatTraverse
def complicatedFunction[F[_]: Traverse : FlatMap, G[_]: Applicative, A: Monoid](ids: F[Int], fetchUser: Int => G[F[User]], consume: User => A): G[A] = {
  ids.flatTraverse(fetchUser)

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import cats._
import cats.data._
import cats.implicits._

case class User(age: Int)

def complicatedFunction[F[_]: Traverse, G[_]: Applicative, A: Monoid](ids: F[Int], fetchUser: Int => G[User], consume: User => A): G[A] = {
  ids.traverse(fetchUser)
    .map(_.foldMap(consume))

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package testing

import cats._
import cats.data._
import cats.implicits._

object Main2 extends App {

  case class Stats(warning: Int, error: Int)

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val keypad: Seq[Seq[Int]] = Seq(Seq(1, 2, 3), Seq(4, 5, 6), Seq(7, 8, 9))

case class Pos(row: Int, col: Int)

sealed trait Dir
case object Up extends Dir
case object Left extends Dir
case object Right extends Dir
case object Down extends Dir

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def splitWhile[A](it: Seq[A])(pred: A => Boolean): (Seq[A], Seq[A]) = {
  (it.takeWhile(pred), it.dropWhile(pred))
}

def splitParenContentsAndRest(s: Seq[Char]): (Seq[Char], Seq[Char]) = {
  assert(s.head == '[')

  val parenCounts = s.scanLeft(0) {
    case (parenCount, '[') => parenCount + 1