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regression in xml type inference #6897

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scabug opened this issue Dec 31, 2012 · 2 comments
Closed

regression in xml type inference #6897

scabug opened this issue Dec 31, 2012 · 2 comments
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@scabug
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@scabug scabug commented Dec 31, 2012

class A {
  val html = (null: Any) match {
    case 1 => <xml:group></xml:group>
    case 2 => <p></p>
  }
}

Compiles in 2.9.2, fails in 2.10 with:

a.scala:5: error: error during expansion of this match (this is a scalac bug).
The underlying error was: type mismatch;
 found   : scala.xml.Node with Serializable{def child: Seq[scala.xml.Node]}
 required: scala.xml.Node with Serializable{def child: scala.xml.Node*}
  val html = (null: Any) match {
                         ^
one error found

Obscure command line option to the rescue: also compiles via

% scalac -Yeta-expand-keeps-star
@scabug
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@scabug scabug commented Dec 31, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6897?orig=1
Reporter: @paulp
Affected Versions: 2.10.0

@scabug
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@scabug scabug commented Dec 31, 2012

@scabug scabug closed this Jan 20, 2013
@scabug scabug added the has PR label Apr 7, 2017
@scabug scabug added this to the 2.10.1 milestone Apr 7, 2017
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