Cache read values in local state, handle mutable variables properly

test/tests/checkpoint merging variable.lua

@@ -0,0 +1,68 @@
+local _={}
+_[27]={}
+_[26]={}
+_[25]={}
+_[24]={}
+_[23]={}
+_[22]={tags=_[27],text="3"}
+_[21]={tags=_[27],text="3: "}
+_[20]={tags=_[26],text="4"}
+_[19]={tags=_[26],text="4: "}
+_[18]={tags=_[25],text="3"}
+_[17]={tags=_[25],text="3: "}
+_[16]={tags=_[24],text="2"}
+_[15]={tags=_[24],text="2: "}
+_[14]={tags=_[23],text="1"}
+_[13]={tags=_[23],text="1: "}
+_[12]={_[21],_[22]}
+_[11]={_[19],_[20]}
+_[10]={_[17],_[18]}
+_[9]={_[15],_[16]}
+_[8]={_[13],_[14]}
+_[7]={"return"}
+_[6]={"text",_[12]}
+_[5]={"error","cancel merge; in Lua function \"error\"; at test/tests/checkpoint merging variable.ans:23"}
+_[4]={"text",_[11]}
+_[3]={"text",_[10]}
+_[2]={"text",_[9]}
+_[1]={"text",_[8]}
+return {_[1],_[2],_[3],_[4],_[5],_[6],_[7]}
+--[[
+{ "text", { {
+      tags = <1>{},
+      text = "1: "
+    }, {
+      tags = <table 1>,
+      text = "1"
+    } } }
+{ "text", { {
+      tags = <1>{},
+      text = "2: "
+    }, {
+      tags = <table 1>,
+      text = "2"
+    } } }
+{ "text", { {
+      tags = <1>{},
+      text = "3: "
+    }, {
+      tags = <table 1>,
+      text = "3"
+    } } }
+{ "text", { {
+      tags = <1>{},
+      text = "4: "
+    }, {
+      tags = <table 1>,
+      text = "4"
+    } } }
+{ "error", 'cancel merge; in Lua function "error"; at test/tests/checkpoint merging variable.ans:23' }
+{ "text", { {
+      tags = <1>{},
+      text = "3: "
+    }, {
+      tags = <table 1>,
+      text = "3"
+    } } }
+{ "return" }
+]]--