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Repeated Type is allowed in a type alias. Subsequent usage in parameter list crashes the compiler. #3180

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scabug opened this issue Mar 15, 2010 · 3 comments
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Repeated Type is allowed in a type alias. Subsequent usage in parameter list crashes the compiler. #3180

scabug opened this issue Mar 15, 2010 · 3 comments
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@odersky

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scabug commented Mar 15, 2010 

scala> type VarArgs =  (Any*)
defined type alias VarArgs

scala> def foo(v: VarArgs) = 0
Exception in thread "main" scala.MatchError: $$iw.$$iw.VarArgs
        at scala.tools.nsc.typechecker.RefChecks$$RefCheckTransformer.varargBridg
e$$1(RefChecks.scala:126)
        at

I think it should be prevented in the same as a by-name params:

scala> type LazyString = (=> String)
<console>:1: error: no by-name parameter type allowed here
       type LazyString = (=> String)
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scabug commented Mar 15, 2010

Imported From: https://issues.scala-lang.org/browse/SI-3180?orig=1
Reporter: @retronym

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scabug commented Mar 15, 2010

@retronym said:
As discovered by @Eastsun: http://stackoverflow.com/questions/2446263/scala-how-to-specify-varargs-as-type/2446657SI-2446657

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scabug commented Mar 16, 2010

@odersky said:
(In r21189) Closes #3180. No review.

@scabug scabug closed this as completed May 18, 2011
@scabug scabug mentioned this issue Apr 7, 2017
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