Sequence is a role; Fix for #1897

coke · coke · commit 2377cab050fa · 2019-07-26T10:36:30.000-04:00
xt/type-graph.t needs to know if something is a role, and
will fail if assumes incorrectly. Be explicit.
diff --git a/type-graph.txt b/type-graph.txt
@@ -212,6 +212,7 @@ role  PositionalBindFailover
 class Seq                           is Cool        does Iterable does PositionalBindFailover
 class RaceSeq                                      does Iterable does Sequence
 class HyperSeq                                     does Iterable does Sequence
+role Sequence
 
 [Composite]
 # Collections: Positional
