Make sure we dump the isPOSIX bit

Author: hamishknight

Sources/_MatchingEngine/Regex/AST/Atom.swift

@@ -314,7 +314,7 @@ extension AST.Atom {
 
     public var _dumpBase: String {
       // FIXME: better printing...
-      "\(kind)\(isInverted)"
+      "\(kind)\(isInverted)\(isPOSIX)"
     }
   }
 }

Tests/RegexTests/ParseTests.swift

@@ -822,6 +822,8 @@ extension RegexTests {
     // Make sure dumping output correctly reflects differences in AST.
     parseNotEqualTest(#"abc"#, #"abd"#)
 
+    parseNotEqualTest(#"[\p{Any}]"#, #"[[:Any:]]"#)
+
     parseNotEqualTest(#"[abc[:space:]\d]+"#,
                       #"[abc[:upper:]\d]+"#)