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Questions tagged [scalac]

scalac - Compiler for the Scala 2 language

176 questions
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Omit package names in Scala compilation errors

Our package names are quite long, and when you include the fact that there can be multiple type parameters in types mentioned in a type mismatch error, some of the compilation errors I get from scalac can be quite long, and it is annoying having to…
Robin Green
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How to decode Scala compiler generated names

Our code is killing the Scala compiler with this message: [error] how can getCommonSuperclass() do its job if different class symbols get the same bytecode-level internal name: scala/Tuple2$mcJD$sp To figure it out I'm trying to understand…
Daniel Darabos
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How to use fsc with sbt?

Related question: Does SBT use the Fast Scala Compiler (fsc)? Can fsc be used with sbt; would it be practical; and if so, how to integrate fsc into sbt?
Dominykas Mostauskis
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class SomeClass in package x cannot be accessed in com.a.y.x

I'm attempting to un-Spring IoC several Java classes and load them directly in some Scala code. Naturally I'm finding that there are name space conflicts between a package like com.a.x.SomeClass and com.a.y.x.SomeClass I've tried using the import…
n0741337
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Why does scalac not optimize away the overhead in simple `for` constructs?

Here's an example of a snippet of code that, at first impression, looks like something that scalac could easily optimize away: val t0 = System.nanoTime() for (i <- 0 to 1000000000) {} val t1 = System.nanoTime() var i = 0 while (i < 1000000000) i +=…
Erik Kaplun
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Scala Compiler crash: What's wrong here?

I was starting to write a unit test for an X500PrincipalBuilder class in Scala. Here's my test code: import org.junit.runner.RunWith import org.scalatest.WordSpec import org.scalatest.junit.JUnitRunner import…
Christian Schlichtherle
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Why does Scalac type mismatch expect Int?

I was working on a project last night, and had some code like this: /* fixes warnings in 2.10 */ import scala.language.implicitConversions /* had some kind of case class with some members */ case class Wrapper[A](x: A) /* for convenience's sake…
jroesch
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-Xdisable-assertions and -Xelide-below not turning off asserts

I'm currently working on a Scala project, that is using SBT, and I'm trying to produce production build settings in which one of the conditions are all asserts are turned off. I simply added the line, to my build.sbt: scalacOptions ++= Seq(...,…
jroesch
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How does Scala handle Java style package statements

This sounds embarrassing. My purpose is to understand how Scala treats package statements, written in the Java style. To this end, I wrote up a little example class (that I named DinnerTimeP.scala as below: package dinnertime class Dinner { val…
ilango
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Why does Scala's Compiler show Scala specific features with "-print" Option?

The help menu of the Scala compiler (2.9.2) says -print Print program with Scala-specific features removed. But the following call with the -print option shows Scala-specific features: C:\Users\John\Test Scala Project\src\main\scala>type…
John Threepwood
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Assertion failed: Invalid interfaces in / assertion failed: ClassBType.info not yet assigned

I fall on this two errors during compilation of my test part and unfortunately my attemps to find any hint to solve these issues failed. I tried to clean, rebuild from scratch without any success. I compiled with and without my idea with same…
KyBe
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Cannot compile and run multiple files in Scala

i am new to scala I have two scala example files under same directory one is: package chap10 import Element.elem abstract class Element { def contents: Array[String] def height: Int = contents.length def width: Int = if (height == 0)…
Aaron Wei
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ERROR Input length = 1 using sbt 1.2.8 scala 2.12.10 play 2.8.1

I'm developing a Play! application using sbt 1.2.8 scala 2.12.10 I'm trying to upgrade Play from 2.7.4 to 2.8.1, but during compilation I get [error] Input length = 1. No stack trace, nothing. It was compiling up until 2.7.4. I've found…
Gyula Bibernáth
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stopping Scala compilation after a particular phase

I'm testing my plugin by running it in-process like this: type PluginMessage = StoreReporter#Info def runPlugin(fileName: String): List[PluginMessage] = { val settings = new Settings settings.outputDirs setSingleOutput (curDir +…
Yuvi Masory
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Implicit conversions applied where not required

Scala apply implicit conversions where not required and make compilation fail with "Type mismatch" error. Example: import scala.language.implicitConversions case class Result(value: String) implicit def intToResult(v: Int): Result =…
David Geirola
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