diff options
| -rw-r--r-- | sources/scala/List.scala | 5 | ||||
| -rw-r--r-- | sources/scala/Predef.scala | 3 |
2 files changed, 7 insertions, 1 deletions
diff --git a/sources/scala/List.scala b/sources/scala/List.scala index ddc2570225..162a0c5974 100644 --- a/sources/scala/List.scala +++ b/sources/scala/List.scala @@ -62,7 +62,10 @@ trait List[+a] extends Seq[a] { def elements: Iterator[a] = new Iterator[a] { var current = List.this; def hasNext: Boolean = !current.isEmpty; - def next: a = { val result = current.head; current = current.tail; result } + def next: a = { if( !hasNext ) + { error( "next on empty Iterator" ) } + else + { val result = current.head; current = current.tail; result } } } /** Returns the list without its last element. diff --git a/sources/scala/Predef.scala b/sources/scala/Predef.scala index f835fdd64a..ebe450a42b 100644 --- a/sources/scala/Predef.scala +++ b/sources/scala/Predef.scala @@ -58,4 +58,7 @@ object Predef { type Triple = Tuple3; def Triple[a, b, c](x: a, y: b, z: c) = Tuple3(x, y, z); + + type Trace = SeqTrace; + type emptyTrace = SeqTraceNil; } |