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Fix #4030: avoid adding duplicate binders #4034

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Feb 27, 2018
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Fix #4030: avoid adding duplicate binders #4034

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4 changes: 3 additions & 1 deletion compiler/src/dotty/tools/dotc/typer/Applications.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -910,8 +910,10 @@ trait Applications extends Compatibility { self: Typer with Dynamic =>
/** Add a `Bind` node for each `bound` symbol in a type application `unapp` */
def addBinders(unapp: Tree, bound: List[Symbol]) = unapp match {
case TypeApply(fn, args) =>
var remain = bound.toSet
def addBinder(arg: Tree) = arg.tpe.stripTypeVar match {
case ref: TypeRef if bound.contains(ref.symbol) =>
case ref: TypeRef if remain.contains(ref.symbol) =>
remain -= ref.symbol
tpd.Bind(ref.symbol, Ident(ref))
case _ =>
arg
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1 change: 1 addition & 0 deletions tests/patmat/i4030.check
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@@ -0,0 +1 @@
9: Pattern Match Exhaustivity: (C4(), _), (_, C4())
13 changes: 13 additions & 0 deletions tests/patmat/i4030.scala
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@@ -0,0 +1,13 @@
sealed trait Root[T]
case object C1 extends Root[Int]
case object C2 extends Root[String]
case class C3[X, Y]() extends Root[(X => X)|(Y => Y)|(X => Y)]
case class C4[X, Y]() extends Root[(X => X)|(Y => Y)|(X => Y)]

object TestGADT {

def f[A <: Seq[_], B, Foo >: A => B](v: Root[Foo], u: Root[Foo]) = (v, u) match {
case (C3(), C3()) =>
}
f(C3[Seq[_], Long](), C4[Seq[_], Long]())
}