Merge pull request #41 from dotty-staging/generic-tuples

Generic tuples improvements

Author: odersky

compiler/test/dotc/pos-test-pickling.blacklist

@@ -67,7 +67,6 @@ mt-redux-norm.perspective.scala
 i18211.scala
 10867.scala
 named-tuples1.scala
-named-tuples-strawman-2.scala
 
 # Opaque type
 i5720.scala

compiler/test/dotc/run-test-pickling.blacklist

@@ -45,4 +45,5 @@ t6138-2
 i12656.scala
 trait-static-forwarder
 i17255
+named-tuples-strawman-2.scala
 

library/src/scala/Tuple.scala

@@ -357,7 +357,7 @@ object Tuples {
     }
   }
 
-  def tail(self: NonEmptyTuple): Tuple = (self: Any) match {
+  def tail(self: Tuple): Tuple = (self: Any) match {
     case xxl: TupleXXL => xxlTail(xxl)
     case _ => specialCaseTail(self)
   }
@@ -565,16 +565,16 @@ object Tuples {
     }
   }
 
-  def init(self: NonEmptyTuple): Tuple = (self: Any) match {
+  def init(self: Tuple): Tuple = (self: Any) match {
     case xxl: TupleXXL => xxlInit(xxl)
     case _ => specialCaseInit(self)
   }
 
-  def last(self: NonEmptyTuple): Any = (self: Any) match {
+  def last(self: Tuple): Any = (self: Any) match {
     case self: Product => self.productElement(self.productArity - 1)
   }
 
-  def apply(self: NonEmptyTuple, n: Int): Any =
+  def apply(self: Tuple, n: Int): Any =
     self.productElement(n)
 
   // Benchmarks showed that this is faster than doing (it1 zip it2).copyToArray(...)

library/src/scala/runtime/Tuples.scala

@@ -13,6 +13,6 @@
   |                      and cannot be shown to be disjoint from it either.
   |                      Therefore, reduction cannot advance to the remaining case
   |
-  |                        case h *: t => h | Tuple.Fold[t, Nothing, [x, y] =>> x | y]
+  |                        case x *: xs => x | Tuple.Fold[xs, Nothing, [x, y] =>> x | y]
   |
   | longer explanation available when compiling with `-explain`

tests/neg/print-tuple-union.check

@@ -87,8 +87,7 @@
    |                                   trying to reduce  shapeless.tuples.length[T2]
    |                                   trying to reduce  Tuple.Size[shapeless.tuples.to[T2]]
    |                                   failed since selector shapeless.tuples.to[T2]
-   |                                   does not uniquely determine parameters x, xs in
-   |                                     case x *: xs => scala.compiletime.ops.int.S[Tuple.Size[xs]]
-   |                                   The computed bounds for the parameters are:
-   |                                     x <: Int
+   |                                   does not uniquely determine parameter xs in
+   |                                     case _ *: xs => scala.compiletime.ops.int.S[Tuple.Size[xs]]
+   |                                   The computed bounds for the parameter are:
    |                                     xs <: (Int, Int)

tests/neg/wildcard-match.check

@@ -1,3 +1,5 @@
+import language.experimental.namedTuples
+
 case class Person(name: String, age: Int)
 
 type PF = NamedTuple.From[Person]

tests/pos/fieldsOf.scala

@@ -8,3 +8,6 @@ def Test =
   summon[Tuple.Filter[(1, 2, 3, 4), P] =:= (1, 2, 4)]
   summon[Tuple.Filter[(1, 2, 3, 4), RejectAll] =:= EmptyTuple]
   summon[Tuple.Filter[EmptyTuple, P] =:= EmptyTuple]
+
+  import compiletime.ops.int.<
+  summon[Tuple.Filter[(1, 4, 7, 2, 10, 3, 4), [X <: Int] =>> X < 5] =:= (1, 4, 2, 3, 4)]