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Regression in @switch pattern matches with guards #5830

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scabug opened this issue May 24, 2012 · 2 comments
Closed

Regression in @switch pattern matches with guards #5830

scabug opened this issue May 24, 2012 · 2 comments
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@scabug
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@scabug scabug commented May 24, 2012

This code succeeds in 2.9.x, but fails in 2.10.0-SNAPSHOT. The old pattern matcher would move the guard inside the branch if there were no other branches with the same value.

import scala.annotation._

object Foo extends App {
	def eof: Boolean = false

	def method(ch: Char) = (ch: @switch) match {
	    case 'a' if eof => println("a with oef")
	    case 'b' => println("b")
	    case 'c' => println("c")
	}
}

It says:

switch-pat.scala:6: error: could not emit switch for @switch annotated match
	def method(ch: Char) = (ch: @switch) match {
                                     ^
one error found
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@scabug scabug commented May 24, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5830?orig=1
Reporter: @dragos
Affected Versions: 2.10.0

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@scabug scabug commented Jul 5, 2012

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