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Trait pattern quasiquote might not match interface traits without mods #8399

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scabug opened this issue Mar 12, 2014 · 4 comments

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@scabug
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commented Mar 12, 2014

scala> val q"trait X { ..$stats }" = q"trait X { def x: Int }"
scala.MatchError: abstract trait X extends scala.AnyRef {
  def x: Int
} (of class scala.reflect.internal.Trees$ClassDef)
  ... 32 elided

Caused by the fact that interface trait has one extra INTERFACE flag which is not expected by the structure of the trait pattern on the left.

@scabug

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commented Mar 12, 2014

Imported From: https://issues.scala-lang.org/browse/SI-8399?orig=1
Reporter: @densh
Affected Versions: 2.11.0-RC1

@scabug

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commented Apr 1, 2014

@densh said:
Workaround: always extract modifiers even if they are not used:

scala> val q"$_ trait $name { ..$stats }" = q"trait X { def x: Int }"
name: reflect.runtime.universe.TypeName = X
stats: List[reflect.runtime.universe.Tree] = List(def x: Int)
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commented Apr 1, 2014

@densh said (edited on Apr 4, 2014 10:35:16 AM UTC):
Note to self: don't forget to update the docs before closing this issue.

@SethTisue

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commented Mar 1, 2018

closing all quasiquotes tickets; see #10755

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