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Match on inner type generates no compiler warning but fails at runtime

3

The attached sample code compiles fine in Scala 2.11.7 and Scala 2.10.3 (Scala 2.9.3 warns that "TestMain.scala:9: error: scrutinee is incompatible with pattern type") - even with `-unchecked -deprecation -feature...

scabug

print tab indentation in REPL

2

## Reproduction steps ```scala scala 2.13.7> 42 val res0: Int = 42 scala 2.13.7> 42 // print 42 // : Int(42) ``` ## Problem ```scala scala 2.13.6> 42 val res0:...

som-snytt

No way to annotate a package

8

Scala does not have any way of placing annotations on a package. In Java, package annotations are placed before the `package` statement in a Java source file named `package-info.java`. The...

scabug

REPL: IndexOutOfBoundsException with `-Xjline:vi`

3

## reproduction steps ```scala ➜ ~ scala -Xjline:vi Welcome to Scala 2.13.8 (OpenJDK 64-Bit Server VM, Java 17.0.2). Type in expressions for evaluation. Or try :help. scala> Exception in thread...

som-snytt

lub of abstract type member

10

This fails to type check (2.13.8) -- Scala 3.1.1 (correctly, IMO) accepts it: ``` object Tst { type F[+A]

adriaanm-da

Extreme compile times in typelevel algorithms when using type aliases

3

## reproduction steps using Scala `2.13.8` and `2.13.9-bin-f11f1f7`, When performing a typelevel algorithm the compile time performance varies wildly depending on any aliases present. Below is a cut down implementation...

jdrphillips

Compiler stack-overflows or fails silently on uncaught cyclic type reference

1

## reproduction steps using Scala (2.13.7), ```scala object lib { trait Tx[+A] { type J[+T] B): J[B] } trait TxBuilder { self => type J[+T] val BTx: lib.TxBuilder type TTx[+T]...

busti

Toolbox can't compile package declaration

3

Toolbox can't compile code if it has package declaration. Next code produces an AssertionError error: ``` import scala.tools.reflect.ToolBox import scala.reflect.runtime.currentMirror val tb = ToolBox(currentMirror).mkToolBox() val parsed = tb.parse("package A {...

alex-ivanov

## reproduction steps ```scala Welcome to Scala 2.13.8 (OpenJDK 64-Bit Server VM, Java 17.0.1). Type in expressions for evaluation. Or try :help. scala> scala> (new Array[Unit](5))(0) == () // Detected...

som-snytt

2.13 IndexedSeqOps does not override foreach in IterableOps

4

## reproduction steps Issue raised at https://discord.com/channels/632150470000902164/632628489719382036/916066258649243659 `LinearSeqOps` got some help https://github.com/scala/scala/commit/cc53ceeb6f17fd9606e09d04b0d4b41a36348e90 ## problem This is a performance regression with respect to 2.12. @scala/collections

som-snytt