bug

bug copied to clipboard

Compiler behavior when importing from Predef is not specified

4

Hi! It's been a while. ## Reproduction steps Scala version: 2.13.14 ```scala import Predef.implicitly object PredefBug { class P def test[X](x :X)(implicit p :X => P) :P = p(x) test...

noresttherein

Overriding `productPrefix` breaks case class hash code

1

``` scala> abstract case class C1(a: Int) | class C2(a: Int) extends C1(a) { override def productPrefix = "C2" } | class C3(a: Int) extends C1(a) { override def productPrefix...

lrytz

WARNING: java.lang.System::load has been called by org.jline.nativ.JLineNativeLoader in an unnamed module

6

## Reproduction steps install jdk 24 ``` $ java --version openjdk 24-ea 2025-03-18 OpenJDK Runtime Environment (build 24-ea+13-1421) OpenJDK 64-Bit Server VM (build 24-ea+13-1421, mixed mode, sharing) ``` launch Scala...

xuwei-k

Empty string tail and init don't throw (unlike WrappedString)

3

## Reproduction steps Scala version: 2.13.14 ```scala scala> "".tail val res0: String = "" scala> "".init val res1: String = "" scala> def tailOf[A](x: Seq[A]) = x.tail def tailOf[A](x: Seq[A]):...

joroKr21

## Reproduction steps 2.13.14 ```scala //"-quickfix:cat=deprecation&msg=Auto-application", "-quickfix:msg=Auto-application", ``` ## Problem The compound filter results in nothing applied, though specifying either cat or msg by itself works. It is safer to...

som-snytt

Object's initialization order

9

Example: ```scala object D { def aaa = 1 //that’s the reason class Z (depends: Any) case object D1 extends Z(aaa) // 'null' when calling D.D1 first time case object...

scabug

Multiple type applications on overloaded method crashes scalac

7

There is a corner case that occurs in the intersection of type application and method overloading. The following program shows an object `A` with an overloaded method `a`, in both...

diesalbla

ClassCastException when calling a trait method with call-by-name argument if implemented as single abstract method

2

The following code: ```scala trait Semigroup[F] { self => def append(f1: F, f2: => F): F val z = 10 } object bug extends App { case class Box(i: Int)...

ruslan2009

ClassCastException on Value Class when implementing an interface using a Single Abstract Method

7

## Reproduction steps [Scastie](https://scastie.scala-lang.org/qzpy5VAcTGqGwDpj1GVFYw) Scala version: 2.13.14 scalac option `-Ydelambdafy:method` (which is the default setting, bug doesn't happen with `-Ydelambdafy:inline`) ```scala case class StringValue(value: String) extends AnyVal trait Foo[A] {...

richard-shurtz

spurious "illegal cyclic reference" in self-referring supertype

2

This is a regression from 2.10.4, in which the following code compiles. ```scala Welcome to Scala version 2.11.1 (OpenJDK 64-Bit Server VM, Java 1.7.0_55). Type in expressions to have them...

scabug