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for-comprehension with type pattern: enumerator not filtered #1089

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scabug opened this issue Jul 3, 2008 · 3 comments
Closed

for-comprehension with type pattern: enumerator not filtered #1089

scabug opened this issue Jul 3, 2008 · 3 comments
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duplicate enhancement help wanted

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@scabug
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scabug commented Jul 3, 2008

Compiling

object Test extends Application {
  val l1 = List(1, "2")
  val l2 = for (i: Int <- l1) yield i+1
}

yields

Test.scala:3: error: type mismatch;
 found   : (Int) => Int
 required: (Any) => ?
  val l2 = for (i: Int <- l1) yield i+1
                ^
one error found

The method TypeBuilder.makeGenerator should transform the generator x: Int <- l1 to

x: Int <- l1.filter {case x: Int => true; case _ => false }

since pattern is not irrefutable for type Any (the list's element type).
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scabug commented Jul 3, 2008

Imported From: https://issues.scala-lang.org/browse/SI-1089?orig=1
Reporter: @lrytz

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scabug commented Jan 14, 2009

@odersky said:
Milestone postponed deleted

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scabug commented Feb 14, 2009

@paulp said:
I am closing as a duplicate and consolidating under ticket #900. See also #1673.

@scabug scabug closed this as completed May 18, 2011
@scabug scabug mentioned this issue Apr 6, 2017
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