diff --git a/moonscript/compile.lua b/moonscript/compile.lua
index 90e1b4b..ee0e8b1 100644
--- a/moonscript/compile.lua
+++ b/moonscript/compile.lua
@@ -101,12 +101,14 @@ Block_ = (function(_parent_0)
     declare = function(self, names)
       local undeclared = (function()
         local _accum_0 = { }
+        local _len_0 = 0
         do
           local _item_0 = names
           for _index_0 = 1, #_item_0 do
             local name = _item_0[_index_0]
             if type(name) == "string" and not self:has_name(name) then
-              table.insert(_accum_0, name)
+              _len_0 = _len_0 + 1
+              _accum_0[_len_0] = name
             end
           end
         end
@@ -316,11 +318,13 @@ Block_ = (function(_parent_0)
         local _with_0 = Line()
         _with_0:append_list((function()
           local _accum_0 = { }
+          local _len_0 = 0
           do
             local _item_0 = values
             for _index_0 = 1, #_item_0 do
               local v = _item_0[_index_0]
-              table.insert(_accum_0, self:value(v))
+              _len_0 = _len_0 + 1
+              _accum_0[_len_0] = self:value(v)
             end
           end
           return _accum_0
diff --git a/moonscript/compile/line.lua b/moonscript/compile/line.lua
index 5262968..77ecc1a 100644
--- a/moonscript/compile/line.lua
+++ b/moonscript/compile/line.lua
@@ -21,11 +21,13 @@ line_compile = {
         local _with_0 = self:line("local ")
         _with_0:append_list((function()
           local _accum_0 = { }
+          local _len_0 = 0
           do
             local _item_0 = names
             for _index_0 = 1, #_item_0 do
               local name = _item_0[_index_0]
-              table.insert(_accum_0, self:name(name))
+              _len_0 = _len_0 + 1
+              _accum_0[_len_0] = self:name(name)
             end
           end
           return _accum_0
@@ -83,11 +85,13 @@ line_compile = {
           end
           _with_0:append_list((function()
             local _accum_0 = { }
+            local _len_0 = 0
             do
               local _item_0 = names
               for _index_0 = 1, #_item_0 do
                 local name = _item_0[_index_0]
-                table.insert(_accum_0, self:value(name))
+                _len_0 = _len_0 + 1
+                _accum_0[_len_0] = self:value(name)
               end
             end
             return _accum_0
@@ -96,11 +100,13 @@ line_compile = {
         _with_0:append(" = ")
         _with_0:append_list((function()
           local _accum_0 = { }
+          local _len_0 = 0
           do
             local _item_0 = values
             for _index_0 = 1, #_item_0 do
               local v = _item_0[_index_0]
-              table.insert(_accum_0, self:value(v))
+              _len_0 = _len_0 + 1
+              _accum_0[_len_0] = self:value(v)
             end
           end
           return _accum_0
@@ -166,11 +172,13 @@ line_compile = {
     if type(source) == "string" then
       local values = (function()
         local _accum_0 = { }
+        local _len_0 = 0
         do
           local _item_0 = final_names
           for _index_0 = 1, #_item_0 do
             local name = _item_0[_index_0]
-            table.insert(_accum_0, get_value(name))
+            _len_0 = _len_0 + 1
+            _accum_0[_len_0] = get_value(name)
           end
         end
         return _accum_0
@@ -334,11 +342,13 @@ line_compile = {
         })
         block = (function()
           local _accum_0 = { }
+          local _len_0 = 0
           do
             local _item_0 = block
             for _index_0 = 1, #_item_0 do
               local s = _item_0[_index_0]
-              table.insert(_accum_0, s)
+              _len_0 = _len_0 + 1
+              _accum_0[_len_0] = s
             end
           end
           return _accum_0
@@ -380,11 +390,13 @@ line_compile = {
       _with_0:append("for ")
       _with_0:append_list((function()
         local _accum_0 = { }
+        local _len_0 = 0
         do
           local _item_0 = names
           for _index_0 = 1, #_item_0 do
             local name = _item_0[_index_0]
-            table.insert(_accum_0, self:name(name))
+            _len_0 = _len_0 + 1
+            _accum_0[_len_0] = self:name(name)
           end
         end
         return _accum_0
@@ -460,11 +472,13 @@ line_compile = {
     end
     constructor.args = (function()
       local _accum_0 = { }
+      local _len_0 = 0
       do
         local _item_0 = constructor.args
         for _index_0 = 1, #_item_0 do
           local arg = _item_0[_index_0]
-          table.insert(_accum_0, get_initializers(arg))
+          _len_0 = _len_0 + 1
+          _accum_0[_len_0] = get_initializers(arg)
         end
       end
       return _accum_0
@@ -472,14 +486,16 @@ line_compile = {
     constructor.arrow = "fat"
     local dests = (function()
       local _accum_0 = { }
+      local _len_0 = 0
       do
         local _item_0 = self_args
         for _index_0 = 1, #_item_0 do
           local name = _item_0[_index_0]
-          table.insert(_accum_0, {
+          _len_0 = _len_0 + 1
+          _accum_0[_len_0] = {
             "self",
             name
-          })
+          }
         end
       end
       return _accum_0
@@ -504,11 +520,13 @@ line_compile = {
         local calling_name = block:get("current_block")
         local slice = (function()
           local _accum_0 = { }
+          local _len_0 = 0
           do
             local _item_0 = chain
             for _index_0 = 3, #_item_0 do
               local item = _item_0[_index_0]
-              table.insert(_accum_0, item)
+              _len_0 = _len_0 + 1
+              _accum_0[_len_0] = item
             end
           end
           return _accum_0
@@ -676,38 +694,39 @@ line_compile = {
     local _, exp, clauses = unpack(node)
     if not action then
       action = function(exp)
-        return exp
+        return {
+          exp
+        }
       end
     end
-    local statement = action(exp)
+    local current_stms = action(exp)
     for _, clause in reversed(clauses) do
       local t = clause[1]
       if t == "for" then
         local names, iter
         _, names, iter = unpack(clause)
-        statement = {
+        current_stms = {
           "foreach",
           names,
           iter,
-          {
-            statement
-          }
+          current_stms
         }
       elseif t == "when" then
         local cond
         _, cond = unpack(clause)
-        statement = {
+        current_stms = {
           "if",
           cond,
-          {
-            statement
-          }
+          current_stms
         }
       else
-        statement = error("Unknown comprehension clause: " .. t)
+        current_stms = error("Unknown comprehension clause: " .. t)
       end
+      current_stms = {
+        current_stms
+      }
     end
-    return self:stm(statement)
+    return self:stms(current_stms)
   end,
   with = function(self, node, ret)
     local _, exp, block = unpack(node)
diff --git a/moonscript/compile/line.moon b/moonscript/compile/line.moon
index d2238f0..6ab61e9 100644
--- a/moonscript/compile/line.moon
+++ b/moonscript/compile/line.moon
@@ -307,21 +307,22 @@ line_compile =
     _, exp, clauses = unpack node
 
     if not action
-      action = (exp) -> exp
+      action = (exp) -> {exp}
 
-    statement = action exp
+    current_stms = action exp
     for _, clause in reversed clauses
       t = clause[1]
-      statement = if t == "for"
+      current_stms = if t == "for"
         _, names, iter = unpack clause
-        {"foreach", names, iter, {statement}}
+        {"foreach", names, iter, current_stms}
       elseif t == "when"
         _, cond = unpack clause
-        {"if", cond, {statement}}
+        {"if", cond, current_stms}
       else
         error "Unknown comprehension clause: "..t
+      current_stms = {current_stms}
 
-    @stm statement
+    @stms current_stms
 
 
   with: (node, ret) =>
diff --git a/moonscript/compile/value.lua b/moonscript/compile/value.lua
index 8db96f2..2303513 100644
--- a/moonscript/compile/value.lua
+++ b/moonscript/compile/value.lua
@@ -6,29 +6,29 @@ require("moonscript.compile.format")
 local ntype = data.ntype
 local concat, insert = table.concat, table.insert
 local table_append
-table_append = function(name, value)
+table_append = function(name, len, value)
   return {
-    "assign",
     {
-      {
-        "chain",
-        name,
-        {
-          "index",
-          {
-            "exp",
-            {
-              "length",
-              name
-            },
-            "+",
-            1
-          }
-        }
-      }
+      "update",
+      len,
+      "+=",
+      1
     },
     {
-      value
+      "assign",
+      {
+        {
+          "chain",
+          name,
+          {
+            "index",
+            len
+          }
+        }
+      },
+      {
+        value
+      }
     }
   }
 end
@@ -40,6 +40,7 @@ create_accumulate_wrapper = function(block_pos)
       local accum_name = _with_0:init_free_var("accum", {
         "table"
       })
+      local count_name = _with_0:init_free_var("len", 0)
       local value_name = _with_0:free_name("value", true)
       local inner = node[block_pos]
       inner[#inner] = {
@@ -59,9 +60,7 @@ create_accumulate_wrapper = function(block_pos)
           "~=",
           "nil"
         },
-        {
-          table_append(accum_name, value_name)
-        }
+        table_append(accum_name, count_name, value_name)
       })
       _with_0:stm(node)
       _with_0:stm({
@@ -85,9 +84,11 @@ value_compile = {
       local _with_0 = self:line()
       _with_0:append_list((function()
         local _accum_0 = { }
+        local _len_0 = 0
         for i, v in ipairs(node) do
           if i > 1 then
-            table.insert(_accum_0, _comp(i, v))
+            _len_0 = _len_0 + 1
+            _accum_0[_len_0] = _comp(i, v)
           end
         end
         return _accum_0
@@ -105,11 +106,13 @@ value_compile = {
       local _with_0 = self:line()
       _with_0:append_list((function()
         local _accum_0 = { }
+        local _len_0 = 0
         do
           local _item_0 = node
           for _index_0 = 2, #_item_0 do
             local v = _item_0[_index_0]
-            table.insert(_accum_0, self:value(v))
+            _len_0 = _len_0 + 1
+            _accum_0[_len_0] = self:value(v)
           end
         end
         return _accum_0
@@ -145,9 +148,10 @@ value_compile = {
       local tmp_name = _with_0:init_free_var("accum", {
         "table"
       })
+      local len_name = _with_0:init_free_var("len", 0)
       local action
       action = function(value)
-        return table_append(tmp_name, value)
+        return table_append(tmp_name, len_name, value)
       end
       _with_0:stm(node, action)
       _with_0:stm({
@@ -229,11 +233,13 @@ value_compile = {
     end
     args = (function()
       local _accum_0 = { }
+      local _len_0 = 0
       do
         local _item_0 = args
         for _index_0 = 1, #_item_0 do
           local arg = _item_0[_index_0]
-          table.insert(_accum_0, format_names(arg))
+          _len_0 = _len_0 + 1
+          _accum_0[_len_0] = format_names(arg)
         end
       end
       return _accum_0
diff --git a/moonscript/compile/value.moon b/moonscript/compile/value.moon
index 606dd8b..136192d 100644
--- a/moonscript/compile/value.moon
+++ b/moonscript/compile/value.moon
@@ -12,23 +12,25 @@ import concat, insert from table
 
 export value_compile
 
-table_append = (name, value) ->
-  {"assign", {
-    {"chain", name, {"index", {"exp", {"length", name}, "+", 1}}}
-  }, { value }}
+table_append = (name, len, value) ->
+  {
+    {"update", len, "+=", 1}
+    {"assign", {
+      {"chain", name, {"index", len}} }, { value }}
+  }
 
 create_accumulate_wrapper = (block_pos) ->
   (node) =>
     with @block "(function()", "end)()"
       accum_name = \init_free_var "accum", {"table"}
+      count_name = \init_free_var "len", 0
       value_name = \free_name "value", true
 
       inner = node[block_pos]
       inner[#inner] = {"assign", {value_name}, {inner[#inner]}}
       insert inner, {
-        "if", {"exp", value_name, "~=", "nil"}, {
-          table_append accum_name, value_name
-        }
+        "if", {"exp", value_name, "~=", "nil"},
+        table_append accum_name, count_name, value_name
       }
 
       \stm node
@@ -73,9 +75,10 @@ value_compile =
 
     with @block!
       tmp_name = \init_free_var "accum", {"table"}
+      len_name = \init_free_var "len", 0
 
       action = (value) ->
-        table_append tmp_name, value
+        table_append tmp_name, len_name, value
 
       \stm node, action
       \stm {"return", tmp_name}
diff --git a/tests/outputs/lists.lua b/tests/outputs/lists.lua
index 71b2fff..63a3aa3 100644
--- a/tests/outputs/lists.lua
+++ b/tests/outputs/lists.lua
@@ -1,12 +1,14 @@
 local hi = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   for _, x in ipairs({
     1,
     2,
     3,
     4
   }) do
-    _accum_0[#_accum_0 + 1] = x * 2
+    _len_0 = _len_0 + 1
+    _accum_0[_len_0] = x * 2
   end
   return _accum_0
 end)()
@@ -20,8 +22,10 @@ local items = {
 }
 local mm = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   for self.x in ipairs(items) do
-    _accum_0[#_accum_0 + 1] = self.x
+    _len_0 = _len_0 + 1
+    _accum_0[_len_0] = self.x
   end
   return _accum_0
 end)()
@@ -32,6 +36,7 @@ for z in ipairs(items) do
 end
 local rad = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   for a in ipairs({
     1,
     2,
@@ -41,7 +46,8 @@ local rad = (function()
     6
   }) do
     if good_number(a) then
-      _accum_0[#_accum_0 + 1] = {
+      _len_0 = _len_0 + 1
+      _accum_0[_len_0] = {
         a
       }
     end
@@ -72,17 +78,21 @@ range = function(count)
 end
 dump((function()
   local _accum_0 = { }
+  local _len_0 = 0
   for x in range(10) do
-    _accum_0[#_accum_0 + 1] = x
+    _len_0 = _len_0 + 1
+    _accum_0[_len_0] = x
   end
   return _accum_0
 end)())
 dump((function()
   local _accum_0 = { }
+  local _len_0 = 0
   for x in range(5) do
     if x > 2 then
       for y in range(5) do
-        _accum_0[#_accum_0 + 1] = {
+        _len_0 = _len_0 + 1
+        _accum_0[_len_0] = {
           x,
           y
         }
@@ -93,11 +103,13 @@ dump((function()
 end)())
 local things = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   for x in range(10) do
     if x > 5 then
       for y in range(10) do
         if y > 7 then
-          _accum_0[#_accum_0 + 1] = x + y
+          _len_0 = _len_0 + 1
+          _accum_0[_len_0] = x + y
         end
       end
     end
@@ -127,8 +139,10 @@ for x in x do
 end
 local x = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   for x in x do
-    _accum_0[#_accum_0 + 1] = x
+    _len_0 = _len_0 + 1
+    _accum_0[_len_0] = x
   end
   return _accum_0
 end)()
@@ -149,11 +163,13 @@ for x in ipairs({
 end
 local double = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   do
     local _item_0 = items
     for _index_0 = 1, #_item_0 do
       local x = _item_0[_index_0]
-      _accum_0[#_accum_0 + 1] = x * 2
+      _len_0 = _len_0 + 1
+      _accum_0[_len_0] = x * 2
     end
   end
   return _accum_0
@@ -167,12 +183,14 @@ do
 end
 local cut = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   do
     local _item_0 = items
     for _index_0 = 1, #_item_0 do
       local x = _item_0[_index_0]
       if x > 3 then
-        _accum_0[#_accum_0 + 1] = x
+        _len_0 = _len_0 + 1
+        _accum_0[_len_0] = x
       end
     end
   end
@@ -180,6 +198,7 @@ local cut = (function()
 end)()
 local hello = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   do
     local _item_0 = items
     for _index_0 = 1, #_item_0 do
@@ -188,7 +207,8 @@ local hello = (function()
         local _item_1 = items
         for _index_1 = 1, #_item_1 do
           local y = _item_1[_index_1]
-          _accum_0[#_accum_0 + 1] = x + y
+          _len_0 = _len_0 + 1
+          _accum_0[_len_0] = x + y
         end
       end
     end
@@ -257,6 +277,7 @@ end
 x = function(...)
   return (function(...)
     local _accum_0 = { }
+    local _len_0 = 0
     do
       local _item_0 = {
         ...
@@ -264,7 +285,8 @@ x = function(...)
       for _index_0 = 1, #_item_0 do
         local x = _item_0[_index_0]
         if f(...) > 4 then
-          _accum_0[#_accum_0 + 1] = x * x
+          _len_0 = _len_0 + 1
+          _accum_0[_len_0] = x * x
         end
       end
     end
@@ -275,8 +297,10 @@ local normal
 normal = function(hello)
   return (function()
     local _accum_0 = { }
+    local _len_0 = 0
     for x in yeah do
-      _accum_0[#_accum_0 + 1] = x
+      _len_0 = _len_0 + 1
+      _accum_0[_len_0] = x
     end
     return _accum_0
   end)()
@@ -285,10 +309,12 @@ local dont_bubble
 dont_bubble = function()
   return (function()
     local _accum_0 = { }
+    local _len_0 = 0
     for x in (function(...)
       return print(...)
     end)("hello") do
-      _accum_0[#_accum_0 + 1] = x
+      _len_0 = _len_0 + 1
+      _accum_0[_len_0] = x
     end
     return _accum_0
   end)()
diff --git a/tests/outputs/loops.lua b/tests/outputs/loops.lua
index d774f42..4375ee4 100644
--- a/tests/outputs/loops.lua
+++ b/tests/outputs/loops.lua
@@ -46,6 +46,7 @@ local hello = {
 }
 x = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   do
     local _item_0 = hello
     for _index_0 = 1, #_item_0 do
@@ -55,7 +56,8 @@ x = (function()
         _value_0 = y
       end
       if _value_0 ~= nil then
-        _accum_0[#_accum_0 + 1] = _value_0
+        _len_0 = _len_0 + 1
+        _accum_0[_len_0] = _value_0
       end
     end
   end
@@ -72,10 +74,12 @@ x = function()
 end
 local t = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   for i = 10, 20 do
     local _value_0 = i * 2
     if _value_0 ~= nil then
-      _accum_0[#_accum_0 + 1] = _value_0
+      _len_0 = _len_0 + 1
+      _accum_0[_len_0] = _value_0
     end
   end
   return _accum_0
@@ -83,11 +87,13 @@ end)()
 local hmm = 0
 local y = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   for j = 3, 30, 8 do
     hmm = hmm + 1
     local _value_0 = j * hmm
     if _value_0 ~= nil then
-      _accum_0[#_accum_0 + 1] = _value_0
+      _len_0 = _len_0 + 1
+      _accum_0[_len_0] = _value_0
     end
   end
   return _accum_0
@@ -101,10 +107,12 @@ end
 _ = function()
   return (function()
     local _accum_0 = { }
+    local _len_0 = 0
     for k = 10, 40 do
       local _value_0 = "okay"
       if _value_0 ~= nil then
-        _accum_0[#_accum_0 + 1] = _value_0
+        _len_0 = _len_0 + 1
+        _accum_0[_len_0] = _value_0
       end
     end
     return _accum_0
@@ -124,11 +132,13 @@ end
 local i = 0
 x = (function()
   local _accum_0 = { }
+  local _len_0 = 0
   while i < 10 do
     i = i + 1
     local _value_0 = i
     if _value_0 ~= nil then
-      _accum_0[#_accum_0 + 1] = _value_0
+      _len_0 = _len_0 + 1
+      _accum_0[_len_0] = _value_0
     end
   end
   return _accum_0
diff --git a/tests/outputs/syntax.lua b/tests/outputs/syntax.lua
index 4969af9..9d49f37 100644
--- a/tests/outputs/syntax.lua
+++ b/tests/outputs/syntax.lua
@@ -91,8 +91,10 @@ x = -hello(world(one(two)))
 local hi = -"herfef"
 x = -(function()
   local _accum_0 = { }
+  local _len_0 = 0
   for x in x do
-    _accum_0[#_accum_0 + 1] = x
+    _len_0 = _len_0 + 1
+    _accum_0[_len_0] = x
   end
   return _accum_0
 end)()