Rakudo has heredocs.

jnthn · jnthn · commit 80d8df37e387 · 2012-11-04T00:03:47.000+01:00
diff --git a/features.json b/features.json
@@ -895,7 +895,7 @@
         "spec"    : [ "http://perlcabal.org/syn/S02.html#User-selected_Brackets" ]
       }, {
         "item"    : "Heredocs",
-        "status"  : "r- n+",
+        "status"  : "r+ n+",
         "code"    : [ ],
         "spec"    : [ "http://perlcabal.org/syn/S02.html#Heredocs" ]
       }, {
