diff --git a/code_obj.lua b/code_obj.lua
index 7b730de..c563a91 100644
--- a/code_obj.lua
+++ b/code_obj.lua
@@ -163,7 +163,7 @@ do
         if start or stop then
           self.source = Source(filename, tonumber(start), tonumber(stop))
         else
-          self.source = Source(self.source, 1, #self + 1)
+          self.source = Source(self.source, 1, #tostring(self) + 1)
         end
       end
       assert(self.source == nil or Source:is_instance(self.source))
@@ -346,7 +346,7 @@ do
           else
             walk(b, pos)
           end
-          pos = pos + #b
+          pos = pos + #tostring(b)
         end
       end
       walk(self, 1)
diff --git a/code_obj.moon b/code_obj.moon
index d038cc8..3364cdf 100644
--- a/code_obj.moon
+++ b/code_obj.moon
@@ -71,7 +71,7 @@ class Code
             if start or stop
                 @source = Source(filename, tonumber(start), tonumber(stop))
             else
-                @source = Source(@source, 1, #self+1)
+                @source = Source(@source, 1, #tostring(self)+1)
         assert(@source == nil or Source\is_instance(@source))
         indent = 0
         for i,b in ipairs @bits
@@ -219,7 +219,7 @@ class Lua extends Code
                         nomsu_to_lua[lua.source.start] = pos
                 else
                     walk b, pos
-                pos += #b
+                pos += #tostring(b)
         walk self, 1
         return {
             nomsu_filename:@source.filename
diff --git a/core/metaprogramming.nom b/core/metaprogramming.nom
index 6d2f764..fd70119 100644
--- a/core/metaprogramming.nom
+++ b/core/metaprogramming.nom
@@ -159,19 +159,6 @@ immediately
     compile [nomsu] to: Lua value "nomsu"
     compile [%var as lua identifier] to: Lua value "nomsu:var_to_lua_identifier(\(%var as lua expr))"
 
-action [action %names metadata]
-    =lua "nomsu.action_metadata[ACTIONS[\%names]]"
-
-# Get the source code for a function
-action [help %action]
-    lua> ".."
-        local metadata = \(action %action metadata);
-        if not metadata then
-            print("Action not found: "..repr(\%action));
-        else
-            print(metadata.src or "<unknown source code>");
-        end
-
 # Compiler tools
 immediately
     compile [run %code] to
diff --git a/core/operators.nom b/core/operators.nom
index 88b0374..fca56d5 100644
--- a/core/operators.nom
+++ b/core/operators.nom
@@ -163,7 +163,14 @@ immediately
     # Unary operators
     compile [- %] to: Lua value "(- \(% as lua expr))"
     compile [not %] to: Lua value "(not \(% as lua expr))"
-    compile [length of %list] to: Lua value "(#\(%list as lua expr))"
+    compile [length of %list] to
+        # A bit of a hack so that luajit works properly.
+        Lua value ".."
+            (function(l)
+                local mt = getmetatable(l);
+                if mt and mt.__len then return mt.__len(l) end
+                return #l
+            end)(\(%list as lua expr))
 
 # Update operators
 immediately
diff --git a/lib/object2.nom b/lib/object2.nom
index 863ee2a..3916fa2 100644
--- a/lib/object2.nom
+++ b/lib/object2.nom
@@ -83,34 +83,36 @@ compile [define object %classname %class_body] to
         %actions <- %line.value.2
         %body <- %line.value.3
         lua> ".."
-            local stubs = {};
-            for i, action in ipairs(\%actions.value) do
-                stubs[i] = nomsu:tree_to_named_stub(action);
-            end
-            local args = {};
-            for i,tok in ipairs(\%actions.value[1].value) do
-                if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
-            end
-            local arg_set = {};
-            for i, arg in ipairs(args) do arg_set[arg] = true; end
-            local body_lua = nomsu:tree_to_lua(\%body);
-            body_lua:convert_to_statements();
-            body_lua:declare_locals();
-            local lua_fn_args = table.concat({"self", unpack(args)}, ", ");
-            local def_tree = nomsu.compilestack[#nomsu.compilestack];
-
-            local compiled_args = {};
-            for i, arg in ipairs(args) do
-                compiled_args[i] = "nomsu:tree_to_lua("..arg..")";
-            end
-            compiled_args = table.concat(compiled_args, "..', '..");
-            table.insert(\%methods, ([==[
-                %s[ %s] = function(%s)
-                    %s
+            do
+                local stubs = {};
+                for i, action in ipairs(\%actions.value) do
+                    stubs[i] = nomsu:tree_to_named_stub(action);
                 end
-            ]==]):format(
-                \%class_identifier, repr(stubs[1]), lua_fn_args,
-                    body_lua));
+                local args = {};
+                for i,tok in ipairs(\%actions.value[1].value) do
+                    if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
+                end
+                local arg_set = {};
+                for i, arg in ipairs(args) do arg_set[arg] = true; end
+                local body_lua = nomsu:tree_to_lua(\%body);
+                body_lua:convert_to_statements();
+                body_lua:declare_locals();
+                local lua_fn_args = table.concat({"self", unpack(args)}, ", ");
+                local def_tree = nomsu.compilestack[#nomsu.compilestack];
+
+                local compiled_args = {};
+                for i, arg in ipairs(args) do
+                    compiled_args[i] = "nomsu:tree_to_lua("..arg..")";
+                end
+                compiled_args = table.concat(compiled_args, "..', '..");
+                table.insert(\%methods, ([==[
+                    %s[ %s] = function(%s)
+                        %s
+                    end
+                ]==]):format(
+                    \%class_identifier, repr(stubs[1]), lua_fn_args,
+                        body_lua));
+            end
 
     return
         Lua ".."
diff --git a/nomsu.lua b/nomsu.lua
index 888011e..67aafae 100644
--- a/nomsu.lua
+++ b/nomsu.lua
@@ -1,5 +1,35 @@
-local re = require('re')
-local lpeg = require('lpeg')
+if jit then
+  package.path = "LPegLJ/src/?.lua;" .. tostring(package.path)
+  lpeg = require('lpeglj')
+  re = require('re')
+  bit32 = require('bit')
+  local _pairs, _ipairs = pairs, ipairs
+  pairs = function(x)
+    do
+      local mt = getmetatable(x)
+      if mt then
+        if mt.__pairs then
+          return mt.__pairs(x)
+        end
+      end
+    end
+    return _pairs(x)
+  end
+  ipairs = function(x)
+    do
+      local mt = getmetatable(x)
+      if mt then
+        if mt.__ipairs then
+          return mt.__ipairs(x)
+        end
+      end
+    end
+    return _ipairs(x)
+  end
+else
+  re = require('re')
+  lpeg = require('lpeg')
+end
 lpeg.setmaxstack(10000)
 local P, R, V, S, Cg, C, Cp, B, Cmt
 P, R, V, S, Cg, C, Cp, B, Cmt = lpeg.P, lpeg.R, lpeg.V, lpeg.S, lpeg.Cg, lpeg.C, lpeg.Cp, lpeg.B, lpeg.Cmt
@@ -41,7 +71,7 @@ FILE_CACHE = setmetatable({ }, {
     if not (file) then
       return nil
     end
-    local contents = file:read("a")
+    local contents = file:read("*a")
     file:close()
     self[filename] = contents
     return contents
@@ -118,7 +148,7 @@ local NOMSU_DEFS
 do
   local _with_0 = { }
   _with_0.Tuple = function(values)
-    return Tuple(table.unpack(values))
+    return Tuple(unpack(values))
   end
   _with_0.DictEntry = function(k, v)
     return Types.DictEntry(k, v)
@@ -343,7 +373,7 @@ do
       if compile_fn == nil then
         compile_fn = nil
       end
-      if #nomsu_code == 0 then
+      if #tostring(nomsu_code) == 0 then
         return nil
       end
       local tree = self:parse(nomsu_code)
@@ -884,46 +914,35 @@ OPTIONS
           break
         end
         local line = nil
-        do
-          local metadata = nomsu.action_metadata[calling_fn.func]
-          if metadata then
-            local filename, start, stop = metadata.source:match("([^:]*):([0-9]*),([0-9]*)")
-            if filename then
-              local file = FILE_CACHE[filename]
-              local line_no = 1
-              for _ in file:sub(1, tonumber(start)):gmatch("\n") do
-                line_no = line_no + 1
-              end
-              local offending_statement = file:sub(tonumber(start), tonumber(stop))
-              if #offending_statement > 50 then
-                offending_statement = offending_statement:sub(1, 50) .. "..."
-              end
-              offending_statement = colored.red(offending_statement)
-              line = colored.yellow(filename .. ":" .. tostring(line_no) .. "\n    " .. offending_statement)
+        _ = [=[            if metadata = nomsu.action_metadata[calling_fn.func]
+                filename, start, stop = metadata.source\match("([^:]*):([0-9]*),([0-9]*)")
+                if filename
+                    file = FILE_CACHE[filename]
+                    line_no = 1
+                    for _ in file\sub(1,tonumber(start))\gmatch("\n") do line_no += 1
+                    offending_statement = file\sub(tonumber(start),tonumber(stop))
+                    if #offending_statement > 50
+                        offending_statement = offending_statement\sub(1,50).."..."
+                    offending_statement = colored.red(offending_statement)
+                    line = colored.yellow(filename..":"..tostring(line_no).."\n    "..offending_statement)
+                else
+                    line = colored.yellow(metadata.source)
+                name = colored.bright(colored.yellow(metadata.aliases[1]))
             else
-              line = colored.yellow(metadata.source)
-            end
-            name = colored.bright(colored.yellow(metadata.aliases[1]))
-          else
-            if calling_fn.istailcall and not name then
-              name = "<tail call>"
-            end
-            if calling_fn.short_src == "./nomsu.moon" and line_table then
-              local char = line_table[calling_fn.currentline]
-              local line_num = 1
-              for _ in nomsu_source:sub(1, char):gmatch("\n") do
-                line_num = line_num + 1
-              end
-              line = colored.cyan(tostring(calling_fn.short_src) .. ":" .. tostring(line_num))
-              name = colored.bright(colored.cyan(name or "???"))
-            else
-              line = colored.blue(tostring(calling_fn.short_src) .. ":" .. tostring(calling_fn.currentline))
-              name = colored.bright(colored.blue(name or "???"))
-            end
-          end
-        end
-        local _from = colored.dim(colored.white("|"))
-        io.stderr:write(("%32s %s %s\n"):format(name, _from, line))
+                if calling_fn.istailcall and not name
+                    name = "<tail call>"
+                if calling_fn.short_src == "./nomsu.moon" and line_table
+                    char = line_table[calling_fn.currentline]
+                    line_num = 1
+                    for _ in nomsu_source\sub(1,char)\gmatch("\n") do line_num += 1
+                    line = colored.cyan("#{calling_fn.short_src}:#{line_num}")
+                    name = colored.bright(colored.cyan(name or "???"))
+                else
+                    line = colored.blue("#{calling_fn.short_src}:#{calling_fn.currentline}")
+                    name = colored.bright(colored.blue(name or "???"))
+            _from = colored.dim colored.white "|"
+            io.stderr\write(("%32s %s %s\n")\format(name, _from, line))
+            ]=]
         _continue_0 = true
       until true
       if not _continue_0 then
@@ -1064,13 +1083,12 @@ OPTIONS
     print_err_msg(error_message)
     return os.exit(false, true)
   end
-  do
-    local ldt = require('ldt')
-    if ldt then
-      ldt.guard(run)
-    else
-      xpcall(run, err_hand)
-    end
+  local ldt
+  ok, ldt = pcall(require, 'ldt')
+  if ok then
+    ldt.guard(run)
+  else
+    xpcall(run, err_hand)
   end
 end
 return NomsuCompiler
diff --git a/nomsu.moon b/nomsu.moon
index cc6b17b..76becf0 100755
--- a/nomsu.moon
+++ b/nomsu.moon
@@ -10,8 +10,30 @@
 --        nomsu:run(your_nomsu_code)
 --    Or from the command line:
 --        lua nomsu.lua [input_file [output_file or -]]
-re = require 're'
-lpeg = require 'lpeg'
+export lpeg, re
+if jit
+    package.path = "LPegLJ/src/?.lua;#{package.path}"
+    lpeg = require 'lpeglj'
+    re = require 're'
+    
+    export bit32
+    bit32 = require('bit')
+
+    _pairs, _ipairs = pairs, ipairs
+    export pairs, ipairs
+    pairs = (x)->
+        if mt = getmetatable(x)
+            if mt.__pairs
+                return mt.__pairs(x)
+        return _pairs(x)
+    ipairs = (x)->
+        if mt = getmetatable(x)
+            if mt.__ipairs
+                return mt.__ipairs(x)
+        return _ipairs(x)
+else
+    re = require 're'
+    lpeg = require 'lpeg'
 lpeg.setmaxstack 10000
 {:P,:R,:V,:S,:Cg,:C,:Cp,:B,:Cmt} = lpeg
 utils = require 'utils'
@@ -44,7 +66,7 @@ FILE_CACHE = setmetatable {}, {
     __index: (filename)=>
         file = io.open(filename)
         return nil unless file
-        contents = file\read("a")
+        contents = file\read("*a")
         file\close!
         self[filename] = contents
         return contents
@@ -111,7 +133,7 @@ Types = require "nomsu_tree"
 NOMSU_DEFS = with {}
     -- Newline supports either windows-style CR+LF or unix-style LF
     .Tuple = (values)->
-        return Tuple(table.unpack(values))
+        return Tuple(unpack(values))
     .DictEntry = (k,v) -> Types.DictEntry(k,v)
     .nl = P("\r")^-1 * P("\n")
     .ws = S(" \t")
@@ -308,7 +330,7 @@ class NomsuCompiler
 
     _nomsu_chunk_counter = 0
     run: (nomsu_code, compile_fn=nil)=>
-        if #nomsu_code == 0 then return nil
+        if #tostring(nomsu_code) == 0 then return nil
         tree = @parse(nomsu_code)
         assert tree, "Failed to parse: #{nomsu_code}"
         assert tree.type == "File", "Attempt to run non-file: #{tree.type}"
@@ -629,6 +651,7 @@ OPTIONS
             name = calling_fn.name
             if name == "run_lua_fn" then continue
             line = nil
+            [=[
             if metadata = nomsu.action_metadata[calling_fn.func]
                 filename, start, stop = metadata.source\match("([^:]*):([0-9]*),([0-9]*)")
                 if filename
@@ -657,6 +680,7 @@ OPTIONS
                     name = colored.bright(colored.blue(name or "???"))
             _from = colored.dim colored.white "|"
             io.stderr\write(("%32s %s %s\n")\format(name, _from, line))
+            ]=]
         io.stderr\flush!
     
     run = ->
@@ -763,7 +787,8 @@ OPTIONS
 
     --ProFi = require 'ProFi'
     --ProFi\start()
-    if ldt = require('ldt')
+    ok, ldt = pcall(require,'ldt')
+    if ok
         ldt.guard run
     else xpcall(run, err_hand)
     --ProFi\stop()
diff --git a/nomsu_tree.lua b/nomsu_tree.lua
index a4940af..8740493 100644
--- a/nomsu_tree.lua
+++ b/nomsu_tree.lua
@@ -1,6 +1,4 @@
 local utils = require('utils')
-local re = require('re')
-local lpeg = require('lpeg')
 local repr, stringify, min, max, equivalent, set, is_list, sum
 repr, stringify, min, max, equivalent, set, is_list, sum = utils.repr, utils.stringify, utils.min, utils.max, utils.equivalent, utils.set, utils.is_list, utils.sum
 local immutable = require('immutable')
diff --git a/nomsu_tree.moon b/nomsu_tree.moon
index 8fe8283..de05795 100644
--- a/nomsu_tree.moon
+++ b/nomsu_tree.moon
@@ -1,8 +1,6 @@
 -- This file contains the datastructures used to represent parsed Nomsu syntax trees,
 -- as well as the logic for converting them to Lua code.
 utils = require 'utils'
-re = require 're'
-lpeg = require 'lpeg'
 {:repr, :stringify, :min, :max, :equivalent, :set, :is_list, :sum} = utils
 immutable = require 'immutable'
 {:insert, :remove, :concat} = table
diff --git a/utils.lua b/utils.lua
index 0d0e034..d9d64c3 100644
--- a/utils.lua
+++ b/utils.lua
@@ -1,8 +1,5 @@
---
 -- A collection of helper utility functions
 --
-local lpeg, re = require("lpeg"), require("re")
-
 local function is_list(t)
     if type(t) ~= 'table' then
         return false
diff --git a/uuid.lua b/uuid.lua
index 878727b..563b950 100644
--- a/uuid.lua
+++ b/uuid.lua
@@ -13,10 +13,10 @@ local function uuid()
     -- Set the four most significant bits (bits 12 through 15) of the
     -- time_hi_and_version field to the 4-bit version number from
     -- Section 4.1.3.
-    bytes[3] = bit32.bor(bytes[3], 0x4000)
+    bytes[3] = bytes[3] + 0x4000
     -- Set the two most significant bits (bits 6 and 7) of the
     -- clock_seq_hi_and_reserved to zero and one, respectively.
-    bytes[4] = bit32.bor(bytes[4], 0xC0)
+    bytes[4] = bytes[4] + 0xC0
     return ("%08x-%04x-%04x-%02x%02x-%6x%6x"):format(unpack(bytes))
 end