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Ihor Kaharlichenko
Well, changing the type of age is not an option, since that would involve changing the production code for the sake of testing. The second option is viable, though. Thank you.
Jason Pickens
Do the generated Arbitrarys ignore other implicits in scope? I haven’t been able to confirm or deny yet but it seems to be the case. For example:
case class Foo(bar: Bar)
implicit val arbBar: Arbitrary[Bar] = somePredefinedArbitraryForBar // This is not used
implicit val arbFoo: Arbitrary[Foo] = MkArbitrary[Foo].arbitrary
Jason Pickens
may have been a PBKAC error
Jason Pickens
Does the library work with recursive types?
I’m getting a StackOverflowError but it might just be me again
Paul Snively
Could someone please offer an example of generating a Shapeless Coproduct, presumably using the aforementioned MkCoproductArbitrary? I'm getting:
could not find implicit value for parameter mkArb: org.scalacheck.derive.MkCoproductArbitrary[takt.data.valkyrie.deployables.etl.VAL1081.ValkyrieType]
Hello. How does one confine generated String vals for a given case class to non-Unicode characters?
Daniel Sebban
Hi I am getting at runtime ava.lang.IllegalArgumentException: requirement failed: Duration is limited to +-(2^63-1)ns (ca. 292 years) [info] at scala.concurrent.duration.FiniteDuration.<init>(Duration.scala:583) [info] at scala.concurrent.duration.Duration$.apply(Duration.scala:31) [info] at scala.concurrent.duration.package$DurationLong$.durationIn$extension(package.scala:48) [info] at scala.concurrent.duration.package$DurationLong.durationIn(package.scala:48)
is there a way to override the Duration generator implicit with a correct one
Gabriel Assis Bezerra
as far as I know, the Arbitrary[T]s in scope are preferred instead of the derived ones
import /*the automatic derivation from the library*/

implicit val arbitraryDuration: Arbitrary[Duration] = ...

implicitly[Arbitrary[SomethingThatNeedsDuration]] // this should use arbitraryDuration

Was just about to post practically the same question as above ... I have:

case class Dense[K: Field](layout: Layout, stride: Int)

but if I put an implicit val stride: Arbitrary[Int] = ... before forAll, in order to limit the values of stride, it's not being picked up. It sounds like the same problem as above?

@dsebban how did you finally resolve your issue?
Ah figured it out - it's the old 'shrink' problem ...
Edmondo Porcu
Hello everyone, how can I get my arbitrary for "integers"
to override a default one only for a specific field of a case class?
Don't think you can do that. You may be able to override the arbitrary for that specific case-class instead though.
Dario Abdulrehman
I may be using it incorrectly but I attempted to use scalacheck-shapeless to automatically generate data for a sealed trait hierarchy. It turned out that the generators are very generic and not very useful for my purposes. For example a case class with a String field apparently uses Arbitrary.arbString and that is too generic for my application. Is there a way to customise the generators for a field using the library?
Dario Abdulrehman
The only way around it I found is to use tagged types and write Arbitrary implicits.
Georgi Krastev
I guess depending on your taste you could also just import your own implicit Arbitrary[String]
If you don't mind having orphan typeclass instances
Dario Abdulrehman
I suppose @edmondo1984 was asking a similar question above
Dario Abdulrehman
@joroKr21 and what if your case class has two different fields of type String which need different instances of Arbitrary. I think in this case you have to use tagged types.
Georgi Krastev
I'm not sure I would have to check
Dario Abdulrehman
The implicit mess + tagged types makes it easier to just hand-craft the case class generators.
Georgi Krastev
yeah if you want customization might be easier to handroll it
with mapN
In theory it would be easy to make it work with LabelledGeneric
And customize your generators based on the field name
But I don't think it exists in scalacheck-shapeless ATM
Akhtiam Sakaev

Hello. I am getting compiler "stackoverflow" when trying to derive generators for scalapb data.

at scala.tools.nsc.typechecker.Implicits$ImplicitSearch.scala$tools$nsc$typechecker$Implicits$ImplicitSearch$$typedImplicit(Implicits.scala:622)
        at scala.tools.nsc.typechecker.Implicits$ImplicitSearch$ImplicitComputation.rankImplicits(Implicits.scala:1213)
        at scala.tools.nsc.typechecker.Implicits$ImplicitSearch$ImplicitComputation.findBest(Implicits.scala:1248)
        at scala.tools.nsc.typechecker.Implicits$ImplicitSearch.searchImplicit(Implicits.scala:1305)
        at scala.tools.nsc.typechecker.Implicits$ImplicitSearch.bestImplicit(Implicits.scala:1730)
        at scala.tools.nsc.typechecker.Implicits.inferImplicit1(Implicits.scala:112)
        at scala.tools.nsc.typechecker.Implicits.inferImplicit(Implicits.scala:91)
        at scala.tools.nsc.typechecker.Implicits.inferImplicit$(Implicits.scala:88)
        at scala.tools.nsc.Global$$anon$5.inferImplicit(Global.scala:483)
        at scala.tools.nsc.typechecker.Implicits.$anonfun$inferImplicit$1(Implicits.scala:144)
        at scala.tools.nsc.typechecker.Implicits.inferImplicit(Implicits.scala:144)
        at scala.tools.nsc.typechecker.Implicits.inferImplicit$(Implicits.scala:142)
        at scala.tools.nsc.Global$$anon$5.inferImplicit(Global.scala:483)
        at scala.reflect.macros.contexts.Typers.inferImplicitValue(Typers.scala:56)
        at scala.reflect.macros.contexts.Typers.inferImplicitValue$(Typers.scala:54)
        at scala.reflect.macros.contexts.Context.inferImplicitValue(Context.scala:18)
        at scala.reflect.macros.contexts.Context.inferImplicitValue(Context.scala:18)
        at shapeless.LazyMacros$DerivationContext$State$.resolveInstance(lazy.scala:303)
        at shapeless.LazyMacros$DerivationContext.resolve0(lazy.scala:421)
        at shapeless.LazyMacros$DerivationContext.$anonfun$deriveLowPriority$1(lazy.scala:449)
        at scala.Option.flatMap(Option.scala:283)
        at shapeless.LazyMacros$DerivationContext.helper$2(lazy.scala:446)
        at shapeless.LazyMacros$DerivationContext.deriveLowPriority(lazy.scala:483)
        at shapeless.LazyMacros$DerivationContext.derive(lazy.scala:494)
        at shapeless.LazyMacros$DerivationContext$State$.deriveInstance(lazy.scala:327)
        at shapeless.LazyMacrosCompat.deriveInstance(lazymacros.scala:50)
        at shapeless.LazyMacrosCompat.deriveInstance$(lazymacros.scala:33)
        at shapeless.LazyMacros$.deriveInstance(lazy.scala:573)
        at shapeless.LazyMacros.mkImpl(lazy.scala:216)
        at shapeless.LazyMacros.mkStrictImpl(lazy.scala:209)
        at shapeless.LazyMacrosRef.mkStrictImpl(lazyref.scala:39)
        at scala.reflect.macros.runtime.JavaReflectionRuntimes$JavaReflectionResolvers.$anonfun$resolveJavaReflectionRuntime$5(JavaReflectionRuntimes.scala:45)

Can I do something with this or I have big nested type that can not be derived?

Georgi Krastev
You could try bumping up the stack
I usually go for -Xss2m
Akhtiam Sakaev
@joroKr21 4m already, doesn't helps 🤷‍♂️
Georgi Krastev
But do you see a loop in the stack trace? From the part you shared I don't.
Also how big is this nested type?
One thing you might try is break it up, i.e. derive generators for the inner types first and then for the outer ones.
Pritam Kadam

Hi,. In the following example, is there a way to create one instance of each subtype predictably, I want to remove randomness and create one instance for each subtype in ADT's?

import org.scalacheck.ScalacheckShapeless._

sealed trait Base
case class BaseIntString(i: Int, s: String) extends Base
case class BaseDoubleBoolean(d: Double, b: Boolean) extends Base

val arb = implicitly[Arbitrary[Base]]

here arb.sample gives random instance for one of the subtype

Felix Bjært Hargreaves
Trying to derive an arbitrary for a big type from an external library, but getting:
Could not write class arbitraries/package$anon$derivedArbitrary$macro$175$1 because it exceeds JVM code size limits. Method inst$macro$139$lzycompute's code too large!
  * Case class representing a canonical Snowplow event.
  * @see https://github.com/snowplow/snowplow/wiki/canonical-event-model
case class Event(app_id:                   Option[String],
                 platform:                 Option[String],
                 etl_tstamp:               Option[Instant],
                 collector_tstamp:         Instant,
                 dvce_created_tstamp:      Option[Instant],
                 event:                    Option[String],
                 event_id:                 UUID,
                 txn_id:                   Option[Int],
                 name_tracker:             Option[String],
                 v_tracker:                Option[String],
                 v_collector:              String,
                 v_etl:                    String,
                 user_id:                  Option[String],
                 user_ipaddress:           Option[String],
                 user_fingerprint:         Option[String],
                 domain_userid:            Option[String],
                 domain_sessionidx:        Option[Int],
                 network_userid:           Option[String],
                 geo_country:              Option[String],
                 geo_region:               Option[String],
                 geo_city:                 Option[String],
                 geo_zipcode:              Option[String],
                 geo_latitude:             Option[Double],
                 geo_longitude:            Option[Double],
                 geo_region_name:          Option[String],
                 ip_isp:                   Option[String],
                 ip_organization:          Option[String],
                 ip_domain:                Option[String],
                 ip_netspeed:              Option[String],
                 page_url:                 Option[String],
                 page_title:               Option[String],
                 page_referrer:            Option[String],
                 page_urlscheme:           Option[String],
                 page_urlhost:             Option[String],
                 page_urlport:             Option[Int],
                 page_urlpath:             Option[String],
                 page_urlquery:            Option[String],
                 page_urlfragment:         Option[String],
                 refr_urlscheme:           Option[String],
                 refr_urlhost:             Option[String],
                 refr_urlport:             Option[Int],
                 refr_urlpath:             Option[String],
                 refr_urlquery:            Option[String],
                 refr_urlfragment:         Option[String],
                 refr_medium:              Option[String],
                 refr_source:              Option[String],
                 refr_term:                Option[String],
                 mkt_medium:               Option[String],
                 mkt_source:               Option[String],
                 mkt_term:                 Option[String],
                 mkt_content:              Option[String],
                 mkt_campaign:             Option[String],
                 contexts:                 Contexts,
                 se_category:              Option[String],
                 se_action:                Option[String],
                 se_label:                 Option[String],
                 se_property:              Option[String],
                 se_value:                 Option[Double],
                 unstruct_event:           UnstructEvent,
                 tr_orderid:               Option[String],
                 tr_affiliation:           Option[String],
                 tr_total:                 Option[Double],
                 tr_tax:                   Option[Double],
                 tr_shipping:              Option[Double],
                 tr_city:                  Option[String],
                 tr_state:                 Option[String],
                 tr_country:               Option[String],
any way to circumvent this?
Georgi Krastev
@hejfelix does it also happen if you just try to get shapeless.Generic[Event]?
Georgi Krastev
how many fields does it have?
Nicolás Cañibano

I'm facing the same issue as @hejfelix, while using implicitly[Arbitrary[BigCaseClass]].arbitrary:

Could not write class xxx because it exceeds JVM code size limits. Method inst$macro$135$lzycompute's code too large!

The case class has 130 fields.
Any workaround to solve this issue? Thanks!

Georgi Krastev
Did you try with just Generic?
What kind of fields does it have? Primitives or other case classes?
Nicolás Cañibano
shapeless.Generic[BigCaseClass] compiles successfully, and the case class has primitive fields only, no nested case classes, any clues how to solve this?