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Make subclasses of scala.quoted.Expr covariant #4896

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Merged
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Aug 5, 2018
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Make subclasses of scala.quoted.Expr covariant #4896

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6 changes: 3 additions & 3 deletions library/src/scala/quoted/Expr.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -31,14 +31,14 @@ object Expr {
*/
object Exprs {
/** An Expr backed by a pickled TASTY tree */
final class TastyExpr[T](val tasty: Pickled, val args: Seq[Any]) extends Expr[T] {
final class TastyExpr[+T](val tasty: Pickled, val args: Seq[Any]) extends Expr[T] {
override def toString: String = s"Expr(<pickled tasty>)"
}

/** An Expr backed by a lifted value.
* Values can only be of type Boolean, Byte, Short, Char, Int, Long, Float, Double, Unit, String or Null.
*/
final class LiftedExpr[T](val value: T) extends Expr[T] {
final class LiftedExpr[+T](val value: T) extends Expr[T] {
override def toString: String = s"Expr($value)"
}

Expand All @@ -54,7 +54,7 @@ object Exprs {
}

/** An Expr representing `'{(~f).apply(~x)}` but it is beta-reduced when the closure is known */
final class FunctionAppliedTo[T, U](val f: Expr[T => U], val x: Expr[T]) extends Expr[U] {
final class FunctionAppliedTo[T, +U](val f: Expr[T => U], val x: Expr[T]) extends Expr[U] {
override def toString: String = s"Expr($f <applied to> $x)"
}
}