Aladdin - Scala Bugtracking
[#368] project: compiler priority: low category: bug
submitter assigned to status date submitted
Nikolay _ open 2004-10-01 14:34:26.0
subject [contrib #40] regular expression patterns throw an error
code 
> val foo : Seq[Char] = "foobar"
val foo: scala.Seq[scala.Char] = String(f, o, o, b, a, r)
> foo match { case Seq('f','o', rest @ _ *) => rest case _ => false }
what happened 
Exception in thread "main" scala.tools.util.debug.AbortError: unresolved name: iter$2.head()._1 - ()scala.Int  ()scala.Int
        at scala.tools.util.debug.Debug.abort(Debug.java:70)
        at scala.tools.util.debug.Debug.abort(Debug.java:76)
        at scalac.util.Debug.abort(Debug.java:99)
        at scalac.ast.TreeGen.Apply(TreeGen.java:443)
        at scalac.ast.TreeGen.mkApplyTV(TreeGen.java:368)
        at scalac.ast.TreeGen.mkApply__(TreeGen.java:407)
        at scalac.ast.TreeGen.mkApply__(TreeGen.java:410)
        at scalac.transformer.matching.CodeFactory.SeqTrace_headState(CodeFactory.java:137)
        at scalac.transformer.matching.RightTracerInScala.loadCurrentElem(RightTracerInScala.java:158)
        at scalac.transformer.matching.Autom2Scala.code_body_NEW(Autom2Scala.java:146)
        at scalac.transformer.matching.RightTracerInScala.getStms(RightTracerInScala.java:431)
        at scalac.transformer.matching.SequenceMatcher.addBinderToBody(SequenceMatcher.java:66)
        at scalac.transformer.matching.SequenceMatcher.construct(SequenceMatcher.java:142)
        at scalac.transformer.matching.AlgebraicMatcher.callSequenceMatcher(AlgebraicMatcher.java:176)
        at scalac.transformer.matching.AlgebraicMatcher.toTree(AlgebraicMatcher.java:104)
        at scalac.transformer.matching.PatternMatcher.toTree(PatternMatcher.java:739)
        at scalac.transformer.matching.PatternMatcher.toTree(PatternMatcher.java:864)
        at scalac.transformer.matching.AlgebraicMatcher.toTree(AlgebraicMatcher.java:107)
        at scalac.transformer.matching.PatternMatcher.toTree(PatternMatcher.java:739)
        at scalac.transformer.matching.AlgebraicMatcher.toTree(AlgebraicMatcher.java:85)
        at scalac.transformer.matching.AlgebraicMatcher.construct(AlgebraicMatcher.java:60)
        at scalac.transformer.matching.AlgebraicMatcher.construct(AlgebraicMatcher.java:45)
        at scala.tools.scalac.transformer.TransMatch$class.transform(TransMatch.scala:132)
        at scala.tools.scalac.transformer.TransMatch$class.transform(TransMatch.scala:179)
        at scalac.ast.Transformer.transform(Transformer.java:284)
        at scalac.ast.Transformer.transform(Transformer.java:214)
        at scalac.transformer.OwnerTransformer.transform(OwnerTransformer.java:145)
        at scala.tools.scalac.transformer.TransMatch$class.transform(TransMatch.scala:191)
        at scalac.transformer.OwnerTransformer.transform(OwnerTransformer.java:41)
        at scalac.transformer.OwnerTransformer.transformTemplateStat(OwnerTransformer.java:87)
        at scalac.transformer.OwnerTransformer.transformTemplateStats(OwnerTransformer.java:76)
        at scalac.transformer.OwnerTransformer.transform(OwnerTransformer.java:68)
        at scalac.transformer.OwnerTransformer.transform(OwnerTransformer.java:100)
        at scala.tools.scalac.transformer.TransMatch$class.transform(TransMatch.scala:191)
        at scalac.ast.Transformer.transform(Transformer.java:284)
        at scalac.transformer.OwnerTransformer.apply(OwnerTransformer.java:35)
        at scala.tools.scalac.transformer.TransMatch$class.apply(TransMatch.scala:41)
        at scala.tools.scalac.transformer.TransMatchPhase$$anon$0.apply(TransMatchPhase.scala:23)
        at scala.tools.scalac.transformer.TransMatchPhase$$anon$0.apply(TransMatchPhase.scala:22)
        at scala.Array.foreach(Array.java:33)
        at scala.tools.scalac.transformer.TransMatchPhase$class.apply(TransMatchPhase.scala:22)
        at scalac.Global.compile(Global.java:390)
        at scalac.Global.compile(Global.java:375)
        at scala.tools.scalai.Interpreter.interpret(Interpreter.java:73)
        at scala.tools.scalai.InterpreterShell.eval(InterpreterShell.java:243)
        at scala.tools.scalai.InterpreterShell.handle(InterpreterShell.java:113)
        at scala.tools.scalai.InterpreterShell.loop(InterpreterShell.java:105)
        at scala.tools.scalai.InterpreterShell.main(InterpreterShell.java:98)
        at scala.tools.scalai.Main.main(Main.java:34)
what expected Interpreter should display List(o,b,a,r): Scala.any
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Changes of this bug report
Nikolay  edited on  2004-10-01 14:36:40.0
Lex  edited on  2006-02-14 14:03:56.0
This crashes the compiler, too, even when used outside the interpreter.
Lex  edited on  2006-02-14 14:11:10.0
Ah, the problem nowadays is different from the one in the "what happened" windowm of the original bug. The current problem is that this example uses a regular expression patterns, which is completedy disabled right now.