Handle events in text interpolation; capture text events in choice lines; improve test script

test/tests/function args vararg empty.lua

@@ -1,19 +1,23 @@
 local _={}
+_[8]={}
 _[7]={}
-_[6]={}
-_[5]={data="[]",tags=_[7]}
-_[4]={data="ok",tags=_[6]}
-_[3]={_[4],_[5]}
+_[6]={tags=_[8],text="[]"}
+_[5]={tags=_[7],text="k"}
+_[4]={tags=_[7],text="o"}
+_[3]={_[4],_[5],_[6]}
 _[2]={"return"}
 _[1]={"text",_[3]}
 return {_[1],_[2]}
 --[[
 { "text", { {
-      data = "ok",
-      tags = {}
+      tags = <1>{},
+      text = "o"
     }, {
-      data = "[]",
-      tags = {}
+      tags = <table 1>,
+      text = "k"
+    }, {
+      tags = {},
+      text = "[]"
     } } }
 { "return" }
 ]]--