VerifyError with anon class passed to right assoc method in constructor argument of anon class that extends trait

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https://github.com/espringe/wisp/blob/04a2c643933b0fec871ba186e233da0019802ebe/src/main/scala/wisp/reader.scala#L64

If you remove that temporary variable (and put the statement inline), the code the compiler generates results in:

Caught1: java.lang.VerifyError: (class:
wisp/Reader$$anonfun$wisp$Reader$$literalListParser$1$$anonfun$apply$36$$anon$7,
method: signature:
(Lwisp/Reader$$anonfun$wisp$Reader$$literalListParser$1$$anonfun$apply$36;Lscala/collection/immutable/List;)V)
Expecting to find object/array on stack

Easy enough to reproduce:

$ git clone git@github.com:espringe/wisp.git
$ cd wisp && git checkout 04a2c643933b0fe
$ sbt test # all works fine
// remove tmp variable /src/main/scala/wisp/reader.scala:L64
$ sbt test # watch it asplode

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Imported From: https://issues.scala-lang.org/browse/SI-6506?orig=1
Reporter: Eric Springer (espringe)
See #6666

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@retronym said:

[info] Resolving org.specs2#specs2_2.10.0-M7;1.13-SNAPSHOT ...
[warn] 	module not found: org.specs2#specs2_2.10.0-M7;1.13-SNAPSHOT
[warn] ==== local: tried
[warn]   /Users/jason/.ivy2/local/org.specs2/specs2_2.10.0-M7/1.13-SNAPSHOT/ivys/ivy.xml
[warn] ==== Sonatype OSS Snapshots: tried
[warn]   https://oss.sonatype.org/content/repositories/snapshots/org/specs2/specs2_2.10.0-M7/1.13-SNAPSHOT/specs2_2.10.0-M7-1.13-SNAPSHOT.pom
[warn] ==== public: tried
[warn]   http://repo1.maven.org/maven2/org/specs2/specs2_2.10.0-M7/1.13-SNAPSHOT/specs2_2.10.0-M7-1.13-SNAPSHOT.pom
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	::          UNRESOLVED DEPENDENCIES         ::
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	:: org.specs2#specs2_2.10.0-M7;1.13-SNAPSHOT: not found
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[error] {file:/Users/jason/code/wisp/}default-5a12e1/*:update: sbt.ResolveException: unresolved dependency: org.specs2#specs2_2.10.0-M7;1.13-SNAPSHOT: not found
[error] Total time: 3 s, completed Oct 11, 2012 8:19:15 AM

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@retronym said:
I can reproduce by changing the Specs version and forcing use of Java 7.

https://gist.github.com/3870578

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@retronym said (edited on Oct 11, 2012 8:03:50 AM UTC):
Here's a minimization. Demonstrated in 2.8.1; this isn't a regression.

 ~/code/scala scala28
Welcome to Scala version 2.8.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_27).
Type in expressions to have them evaluated.
Type :help for more information.

scala> object S { def #::(a: Any): Any = () }              
defined module S

scala> trait T; class WL(a: Any); new WL(new {} #:: S) with T 
java.lang.VerifyError: (class: $anon$1, method: <init> signature: ()V) Expecting to find object/array on stack
	at .<init>(<console>:8)

scala> trait T; class WL(a: Any); new WL(S.#::(new {})) with T
defined trait T
defined class WL

scala> class WL(a: Any); new WL(new {} #:: S)           
defined class WL

scala> trait T; class WL(a: Any); object X extends WL(new {} #:: S) with T; X     
defined trait T
defined class WL
defined module X

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@gkossakowski said:
I heard from James Iry that Jason is looking into this problem so I'm reassigning it.

My opinion is that we should reject declaring classes in super constructor calls.

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@retronym said:
Looks like a variation of #6666.