Make Seq.elems call iterator.count-only

Provide a shortcut when we want an iterator to just find out the number of elems and nothing else (think "words".IO.lines.elems)
rakudo · Sep 19, 2015 · c5407d2 · c5407d2
1 parent 8158cb5
commit c5407d2
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/core/Seq.pm b/src/core/Seq.pm
@@ -77,7 +77,9 @@ my class Seq is Cool does Iterable does PositionalBindFailover {
     }
 
     method elems() {
-        self.cache.elems;
+        self.is-lazy
+          ?? fail X::Cannot::Lazy.new(action => '.elems').new
+          !! self.iterator.count-only;
     }
 
     method Numeric() {