paulp

from    Razvan Cojocaru pub@razie.com
to	scala-user@googlegroups.com
date	Tue, Sep 13, 2011 at 11:07 AM
subject	[scala-user] unexpected REPL equals

The REPL unexpectedly calls equals with a String - this behavior is new in 2.9.1. – in the code below, I know the equals sucks but is short and used to work since 2.8
 
What to do? What to do?
 
$ scala

paulp

---
- &CENTER { x: 1, y: 2 }
- &LEFT { x: 0, y: 2 }
- &BIG { r: 10 }
- &SMALL { r: 1 }

# All the following maps are equal:

- # Explicit keys
  x: 1

paulp

% scala
Welcome to Scala version 2.10.0.r25823-b20111011192940 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.

scala> class Bippy extends java.util.Collection[Int]
<console>:7: error: class Bippy is missing 13 methods:
As seen from class Bippy, the missing method signatures are as follows.
(For convenience, these are usable as stub implementations.)

paulp

> inspectr package
[info] compile:package = Task[java.io.File]
[info]   +-compile:package-bin = Task[java.io.File]
[info]     +-compile:package-configuration(for package-bin) = Task[sbt.Package$Configuration]
[info]     | +-compile:mappings(for package-bin) = Task[scala.collection.Seq[scala.Tuple2[java.i..
[info]     | | +-compile:products = Task[scala.collection.Seq[java.io.File]]
[info]     | | 
[info]     | +-compile:artifact-path(for package-bin) = target/scala-2.10.0-SNAPSHOT/scala-impro..
[info]     | | +-*:cross-target = target/scala-2.10.0-SNAPSHOT
[info]     | | +-*/*:artifact-name = <function3>

paulp

[user]
  name = Paul Phillips
  email = paulp@improving.org
[github]
  user = $GITHUB_USER
  token = $GITHUB_TOKEN
[clean]
  requireForce = false
[grep]
  lineNumber = true

paulp

java
-XX:+CMSClassUnloadingEnabled
-XX:MaxPermSize=384m
-XX:ReservedCodeCacheSize=128m
-Xmx1536m
-Xms1536m
-Xmx3g
-Xms3g
-Xms1536m
-Xmx1536m

paulp

#!/usr/bin/env bash
#
# ^-- don't assume bash is in /bin

# we need a git library of stuff like this, since there are lots
# of ways to get it subtly wrong
git_branch_exists () {
  git show-ref --verify --quiet refs/heads/$1
}

paulp

class A {
  def f[T, U, CC[_]](x: CC[T], y: U)(implicit o: U) = x
  
  f(List("a"), (x: String) => x.toSeq)
}

[paulp@stem ~ (master)]$ scalac3 -Dscalac.debug.tvar ./a.scala 
[    create] ?T                       ( In A#f[T,U,CC[_]] )
[    create] ?U                       ( In A#f[T,U,CC[_]] )
[    create] ?CC                      ( In A#f[T,U,CC[_]] )

paulp

// a.scala
// Fri Jan 27 08:21:56 PST 2012

class ModuleID(val organization: String, val name: String, val revision: String)

trait ProviderCreation {
  def fromUrls(urls: Seq[URL]): MultiProvider
  def fromUrl(url: URL): UrlProvider
  def fromPath(path: PathType): SinglePathProvider
  def fromClassPath(classPath: String): ClassPathProvider

paulp

  def initializeFromClassRep(owner: Symbol, classRep: ClassRep) {
    val useSource = classRep match {
      case DualClassRep(_, _) => platform needCompile classRep
      case SourceRep(_)       => true
      case BinaryRep(_)       => false
      case _                  => println("nothing") ; return
    }
    vinform("[%s] %s %s".format(
      if (useSource) "src" else "bin", owner, classRep))