diff --git a/core/metaprogramming.nom b/core/metaprogramming.nom
index d7409d2..0c7cada 100644
--- a/core/metaprogramming.nom
+++ b/core/metaprogramming.nom
@@ -5,14 +5,13 @@
 # Compile-time action to make compile-time actions:
 immediately:
     lua> ".."
-        nomsu:define_compile_action("compile %actions to %lua", \(!! code location !!), function(\%actions, \%lua)
-            local tree = nomsu.compilestack[#nomsu.compilestack];
+        nomsu:define_compile_action("compile %actions to %lua", \(!! code location !!), function(tree, \%actions, \%lua)
             local lua = Lua(tree.source, "nomsu:define_compile_action(");
             local stubs = {};
             for i, action in ipairs(\%actions.value) do
                 stubs[i] = nomsu:tree_to_named_stub(action);
             end
-            lua:append(repr(stubs), ", ", repr(tree.source:get_line()), ", function(");
+            lua:append(repr(stubs), ", ", repr(tree.source:get_line()), ", function(tree");
             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
@@ -21,10 +20,10 @@ immediately:
                 error("Invalid type for 'compile % to %', expected a dict with expr/statements, but got text.", 0);
             end
             for i, arg in ipairs(args) do
+                lua:append(", ");
                 lua:append(arg);
-                if i < #args then lua:append(", ") end
             end
-            local body_lua = nomsu:tree_to_lua(\%lua):as_statements();
+            local body_lua = nomsu:tree_to_lua(\%lua):as_statements("return ");
             body_lua:declare_locals(args);
             lua:append(")\\n    ", body_lua, "\\nend);")
             return lua;
@@ -34,7 +33,6 @@ immediately:
 immediately:
     compile [action %actions %body] to:
         lua> ".."
-            local tree = nomsu.compilestack[#nomsu.compilestack];
             local lua = Lua(tree.source, "nomsu:define_action(");
             local stubs = {};
             for i, action in ipairs(\%actions.value) do
@@ -49,7 +47,7 @@ immediately:
                 lua:append(arg);
                 if i < #args then lua:append(", ") end
             end
-            local body_lua = nomsu:tree_to_lua(\%body):as_statements();
+            local body_lua = nomsu:tree_to_lua(\%body):as_statements("return ");
             body_lua:declare_locals(args);
             lua:append(")\\n    ", body_lua, "\\nend);")
             return lua;
@@ -58,20 +56,19 @@ immediately:
 immediately:
     compile [parse %shorthand as %longhand] to:
         lua> ".."
-            local tree = nomsu.compilestack[#nomsu.compilestack];
             local lua = Lua(tree.source, "nomsu:define_compile_action(");
             local stubs = {};
             for i, action in ipairs(\%shorthand.value) do
                 stubs[i] = nomsu:tree_to_named_stub(action);
             end
-            lua:append(repr(stubs), ", ", repr(tree.source:get_line()), ", function(");
+            lua:append(repr(stubs), ", ", repr(tree.source:get_line()), ", function(tree");
             local args = {};
             for i,tok in ipairs(\%shorthand.value[1].value) do
                 if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
             end
             for i, arg in ipairs(args) do
+                lua:append(", ");
                 lua:append(arg);
-                if i < #args then lua:append(", ") end
             end
             local template;
             if \%longhand.type == "Block" then
@@ -127,14 +124,14 @@ immediately:
         =lua "nomsu:tree_to_stub(\%tree)"
     
 immediately:
-    compile [%tree's source code, %tree' source code] to {expr:"\(%tree as lua expr).source:get_text()"}
+    compile [%tree's source code, %tree' source code] to: LuaValue "\(%tree as lua expr).source:get_text()"
 
-    compile [repr %obj] to {expr:"repr(\(%obj as lua expr))"}
-    compile [type of %obj] to {expr:"type(\(%obj as lua expr))"}
+    compile [repr %obj] to: LuaValue "repr(\(%obj as lua expr))"
+    compile [type of %obj] to: LuaValue "type(\(%obj as lua expr))"
 
 immediately:
-    compile [nomsu] to {expr:"nomsu"}
-    compile [%var as lua identifier] to {expr:"nomsu:var_to_lua_identifier(\(%var as lua expr))"}
+    compile [nomsu] to: LuaValue "nomsu"
+    compile [%var as lua identifier] to: LuaValue "nomsu:var_to_lua_identifier(\(%var as lua expr))"
 
 action [action %names metadata]:
     =lua "nomsu.action_metadata[ACTIONS[\%names]]"
@@ -151,9 +148,8 @@ action [help %action]:
 
 # Compiler tools
 immediately:
-    #local def_metadata = nomsu.tree_metadata[nomsu.compilestack[#nomsu.compilestack]];
-    compile [run %code] to {..}
-        expr: ".."
+    compile [run %code] to:
+        LuaValue ".."
             nomsu:run(\(%code as lua expr), '\
                 =lua "nomsu:get_line_number(nomsu.compilestack[#nomsu.compilestack])"
             ..')
@@ -164,44 +160,40 @@ immediately:
     compile [show lua %block] to:
         lua> ".."
             local \%lua = nomsu:tree_to_lua(\%block);
-            return {statements = "print("..repr(\%lua.statements or \%lua.expr)..");"};
+            return Lua(\%block.source, "print(", repr(tostring(\%lua)), ");");
 
 immediately:
     compile [say %message] to:
         lua> ".."
+            local tree = nomsu.compilestack[#nomsu.compilestack];
             if \%message.type == "Text" then
-                return {statements="print("..\(%message as lua expr)..");"};
+                return Lua(tree.source, "print(", \(%message as lua expr), ");");
             else
-                return {statements="print(stringify("..\(%message as lua expr).."));"};
+                return Lua(tree.source, "print(stringify(", \(%message as lua expr), "));");
             end
 
 # Return
 immediately:
     #.. Return statement is wrapped in a do..end block because Lua is unhappy if you
         put code after a return statement, unless you wrap it in a block.
-    compile [return] to {statements:"do return; end"}
-    compile [return %return_value] to {statements:"do return \(%return_value as lua expr); end"}
+    compile [return] to: Lua "do return; end"
+    compile [return %return_value] to: Lua "do return \(%return_value as lua expr); end"
 
 # Error functions
 immediately:
-    compile [barf] to {statements:"error(nil, 0);"}
-    compile [barf %msg] to {statements:"error(\(%msg as lua expr), 0);"}
+    compile [barf] to: LuaValue "error(nil, 0);"
+    compile [barf %msg] to: LuaValue "error(\(%msg as lua expr), 0);"
     compile [assume %condition] to:
         lua> "local \%assumption = 'Assumption failed: '..\%condition.source:get_text();"
-        return {..}
-            statements:".."
+        return:
+            Lua ".."
                 if not \(%condition as lua expr) then
                     error(\(repr %assumption), 0);
                 end
-    compile [assume %condition or barf %msg] to {..}
-        statements:".."
-            if not \(%condition as lua expr) then
-                error(\(%msg as lua expr), 0);
-            end
 
 # Literals
 immediately:
-    compile [yes] to {expr:"true"}
-    compile [no] to {expr:"false"}
-    compile [nothing, nil, null] to {expr:"nil"}
+    compile [yes] to: LuaValue "true"
+    compile [no] to: LuaValue "false"
+    compile [nothing, nil, null] to: LuaValue "nil"
 
diff --git a/lua_obj.moon b/lua_obj.moon
index 6cc3e00..1979c94 100644
--- a/lua_obj.moon
+++ b/lua_obj.moon
@@ -3,29 +3,26 @@ immutable = require 'immutable'
 local Lua, LuaValue, Location
 export LINE_STARTS
 
-Location = immutable {"text_name","text","start","stop"}, {
+Location = immutable {"filename","start","stop"}, {
     name:"Location"
-    __new: (text_name, text, start, stop)=>
-        assert(type(text_name) == 'string')
-        assert(type(text) == 'string')
-        assert(type(start) == 'number')
-        assert(type(stop or start) == 'number')
-        return text_name, text, start, stop or start
-    __tostring: => "#{@text_name}[#{@start}:#{@stop}]"
+    __new: (filename, start, stop)=>
+        assert(type(filename) == 'string' and type(start) == 'number' and type(stop) == 'number')
+        return filename, start, stop or start
+    __tostring: => "Location(\"#{@filename}\", #{@start}, #{@stop})"
     __lt: (other)=>
-        assert(@text == other.text, "Cannot compare sources from different texts")
+        assert(@filename == other.filename, "Cannot compare sources from different files")
         return if @start == other.start
             @stop < other.stop
         else @start < other.start
     __le: (other)=>
-        assert(@text == other.text, "Cannot compare sources from different texts")
+        assert(@filename == other.filename, "Cannot compare sources from different files")
         return if @start == other.start
             @stop <= other.stop
         else @start <= other.start
-    get_text: => @text\sub(@start,@stop)
+    get_text: => FILE_CACHE[@filename]\sub(@start,@stop)
     get_line_number: =>
         -- TODO: do a binary search if this is actually slow, which I doubt
-        line_starts = LINE_STARTS[@text]
+        line_starts = LINE_STARTS[FILE_CACHE[@filename]]
         start_line = 1
         while (line_starts[start_line+1] or (#src+1)) <= @start
             start_line += 1
@@ -33,12 +30,12 @@ Location = immutable {"text_name","text","start","stop"}, {
         while (line_starts[stop_line+1] or (#src+1)) <= @stop
             stop_line += 1
         return start_line, stop_line
-    get_line: => "#{@text_name}:#{@get_line_number!}"
+    get_line: => "#{@filename}:#{@get_line_number!}"
     get_line_range: =>
         start_line, stop_line = @get_line_number!
         return if stop_line == start_line
-            "#{text_name}:#{start_line}"
-        else "#{text_name}:#{start_line}-#{stop_line}"
+            "#{@filename}:#{start_line}"
+        else "#{@filename}:#{start_line}-#{stop_line}"
 }
 
 class Lua
@@ -46,6 +43,9 @@ class Lua
     is_value: false
 
     new: (@source, ...)=>
+        if type(@source) == 'string'
+            filename,start,stop = @source\match("^(.-)[(%d+):(%d+)]$")
+            @source = Location(filename, tonumber(start), tonumber(stop))
         for i=1,select("#",...)
             x = select(i,...)
             assert(type(x) != 'table' or getmetatable(x))
@@ -109,7 +109,7 @@ class Lua
         -- Return a mapping from output (lua) character number to input (nomsu) character number
         lua_str = tostring(self)
         metadata = {
-            nomsu_filename:@source.text_name, nomsu_file:@source.text,
+            nomsu_filename:@source.filename
             lua_filename:lua_chunkname, lua_file:lua_str
             lua_to_nomsu: {}, nomsu_to_lua: {}
         }
@@ -122,7 +122,7 @@ class Lua
                 for b in *lua.bits
                     walk b
                 lua_stop = lua_offset
-                nomsu_src, lua_src = lua.source, Location(lua_chunkname, lua_str, lua_start, lua_stop)
+                nomsu_src, lua_src = lua.source, Location(lua_chunkname, lua_start, lua_stop)
                 metadata.lua_to_nomsu[lua_src] = nomsu_src
                 metadata.nomsu_to_lua[nomsu_src] = lua_src
         walk self
@@ -143,9 +143,9 @@ class LuaValue extends Lua
         assert(not ret\match(".*table: 0x.*"))
         return ret
 
-    as_statements: =>
-        bits = {unpack @bits}
-        bits[#bits+1] = ";"
+    as_statements: (prefix="", suffix=";")=>
+        bits = {prefix, unpack @bits}
+        bits[#bits+1] = suffix
         return Lua(@source, unpack(bits))
 
     parenthesize: =>
diff --git a/nomsu.lua b/nomsu.lua
index ba1d813..2df72be 100644
--- a/nomsu.lua
+++ b/nomsu.lua
@@ -32,7 +32,7 @@ do
   local _obj_0 = require("lua_obj")
   Lua, LuaValue, Location = _obj_0.Lua, _obj_0.LuaValue, _obj_0.Location
 end
-local FILE_CACHE = setmetatable({ }, {
+FILE_CACHE = setmetatable({ }, {
   __index = function(self, filename)
     local file = io.open(filename)
     if not (file) then
@@ -196,7 +196,7 @@ do
       pos = pos + #lpeg.userdata.source_code:match("[ \t\n\r]*", pos)
     end
     local line_no = 1
-    local text_loc = Location(lpeg.userdata.filename, src, pos)
+    local text_loc = Location(lpeg.userdata.filename, pos)
     line_no = text_loc:get_line_number()
     local prev_line = src:sub(LINE_STARTS[src][line_no - 1] or 1, LINE_STARTS[src][line_no] - 1)
     local err_line = src:sub(LINE_STARTS[src][line_no], (LINE_STARTS[src][line_no + 1] or 0) - 1)
@@ -215,7 +215,7 @@ setmetatable(NOMSU_DEFS, {
       if type(value) == 'table' then
         error("Not a tuple: " .. tostring(repr(value)))
       end
-      local loc = Location(lpeg.userdata.filename, lpeg.userdata.source_code, start, stop)
+      local loc = Location(lpeg.userdata.filename, start, stop)
       local node = Types[key](value, loc)
       return node
     end
@@ -282,9 +282,6 @@ do
             end
             arg_positions = _accum_0
           end
-          if #arg_positions ~= #args then
-            error("Mismatch in args between lua function's " .. tostring(repr(fn_arg_positions)) .. " and stub's " .. tostring(repr(args)) .. " for " .. tostring(repr(stub)), 0)
-          end
           arg_orders[stub] = arg_positions
         end
       end
@@ -379,7 +376,8 @@ do
       local tree = self:parse(nomsu_code, filename)
       assert(tree, "Failed to parse: " .. tostring(nomsu_code))
       assert(tree.type == "File", "Attempt to run non-file: " .. tostring(tree.type))
-      local lua = self:tree_to_lua(tree):as_statements():with_locals_declared()
+      local lua = self:tree_to_lua(tree):as_statements()
+      lua:declare_locals()
       lua:prepend("-- File: " .. tostring(filename) .. "\n")
       return self:run_lua(lua, filename .. ".lua")
     end,
@@ -449,8 +447,9 @@ do
           _chunk_counter = _chunk_counter + 1
           filename = "<lua chunk #" .. tostring(_chunk_counter) .. ">"
         else
-          filename = lua.source.text_name .. ".lua"
+          filename = lua.source.filename .. ".lua"
         end
+        FILE_CACHE[filename] = tostring(lua)
       end
       if type(lua) ~= 'string' then
         local metadata
@@ -475,7 +474,7 @@ do
         return tree.value[1]
       end
       local lua = Lua(tree.source, "return ", self:tree_to_lua(tree), ";")
-      return self:run_lua(lua, tree.source.text_name)
+      return self:run_lua(lua, tree.source.filename)
     end,
     tree_to_nomsu = function(self, tree, indentation, max_line, expr_type)
       if indentation == nil then
@@ -896,9 +895,9 @@ do
         file_lua:declare_locals()
         return file_lua
       elseif "Comment" == _exp_0 then
-        return Lua(tree.source, "--" .. tree.value:gsub("\n", "\n--"))
+        return Lua(tree.source, "--" .. tree.value:gsub("\n", "\n--") .. "\n")
       elseif "Nomsu" == _exp_0 then
-        return Lua(tree.source, "nomsu:parse(", tree.source:get_text(), ", ", repr(tree.source.text_name), ")")
+        return Lua(tree.source, "nomsu:parse(", tree.source:get_text(), ", ", repr(tree.source.filename), ")")
       elseif "Block" == _exp_0 then
         local block_lua = Lua(tree.source)
         for i, arg in ipairs(tree.value) do
@@ -941,14 +940,14 @@ do
               local _list_1 = metadata.arg_orders[stub]
               for _index_0 = 1, #_list_1 do
                 local p = _list_1[_index_0]
-                _accum_0[_len_0] = args[p]
+                _accum_0[_len_0] = args[p - 1]
                 _len_0 = _len_0 + 1
               end
               new_args = _accum_0
             end
             args = new_args
           end
-          local lua = action(unpack(args))
+          local lua = action(tree, unpack(args))
           remove(self.compilestack)
           return lua
         elseif not metadata and self.__class.math_patt:match(stub) then
@@ -1367,15 +1366,61 @@ do
         return "nomsu.moon:" .. tostring(debug_getinfo(2).currentline)
       end
       local nomsu = self
-      self:define_compile_action("immediately %block", get_line_no(), function(_block)
+      self:define_compile_action("immediately %block", get_line_no(), function(self, _block)
         local lua = nomsu:tree_to_lua(_block):as_statements()
         lua:declare_locals()
         nomsu:run_lua(lua)
-        return Lua(_block.source, "if IMMEDIATE then\n", lua, "\nend")
+        return Lua(self.source, "if IMMEDIATE then\n", lua, "\nend")
       end)
-      self:define_compile_action("lua> %code", get_line_no(), function(_code)
+      self:define_compile_action("Lua %code", get_line_no(), function(self, _code)
         if _code.type ~= "Text" then
-          return LuaValue(_code.source, "nomsu:run_lua(", nomsu:tree_to_lua(_code), ")")
+          return LuaValue(self.source, "Lua(", repr(_code.source), ", ", nomsu:tree_to_lua(_code), ")")
+        end
+        local lua = LuaValue(self.source, "Lua(", repr(_code.source))
+        local _list_1 = _code.value
+        for _index_0 = 1, #_list_1 do
+          local bit = _list_1[_index_0]
+          lua:append(", ")
+          if type(bit) == "string" then
+            lua:append(repr(bit))
+          else
+            local bit_lua = nomsu:tree_to_lua(bit)
+            if not (bit_lua.is_value) then
+              local line, src = bit.source:get_line(), bit.source:get_text()
+              error(tostring(line) .. ": Cannot use " .. tostring(colored.yellow(src)) .. " as a string interpolation value, since it's not an expression.", 0)
+            end
+            lua:append(bit_lua)
+          end
+        end
+        lua:append(")")
+        return lua
+      end)
+      self:define_compile_action("LuaValue %code", get_line_no(), function(self, _code)
+        if _code.type ~= "Text" then
+          return LuaValue(self.source, "LuaValue(", repr(_code.source), ", ", nomsu:tree_to_lua(_code), ")")
+        end
+        local lua = LuaValue(self.source, "LuaValue(", repr(_code.source))
+        local _list_1 = _code.value
+        for _index_0 = 1, #_list_1 do
+          local bit = _list_1[_index_0]
+          lua:append(", ")
+          if type(bit) == "string" then
+            lua:append(repr(bit))
+          else
+            local bit_lua = nomsu:tree_to_lua(bit)
+            if not (bit_lua.is_value) then
+              local line, src = bit.source:get_line(), bit.source:get_text()
+              error(tostring(line) .. ": Cannot use " .. tostring(colored.yellow(src)) .. " as a string interpolation value, since it's not an expression.", 0)
+            end
+            lua:append(bit_lua)
+          end
+        end
+        lua:append(")")
+        return lua
+      end)
+      self:define_compile_action("lua> %code", get_line_no(), function(self, _code)
+        if _code.type ~= "Text" then
+          return LuaValue(self.source, "nomsu:run_lua(", nomsu:tree_to_lua(_code), ")")
         end
         local lua = Lua(_code.source)
         local _list_1 = _code.value
@@ -1394,11 +1439,11 @@ do
         end
         return lua
       end)
-      self:define_compile_action("=lua %code", get_line_no(), function(_code)
+      self:define_compile_action("=lua %code", get_line_no(), function(self, _code)
         if _code.type ~= "Text" then
-          return LuaValue(_code.source, "nomsu:run_lua(", nomsu:tree_to_lua(_code), ")")
+          return LuaValue(self.source, "nomsu:run_lua(", nomsu:tree_to_lua(_code), ")")
         end
-        local lua = LuaValue(_code.source)
+        local lua = LuaValue(self.source)
         local _list_1 = _code.value
         for _index_0 = 1, #_list_1 do
           local bit = _list_1[_index_0]
@@ -1415,18 +1460,16 @@ do
         end
         return lua
       end)
-      self:define_compile_action("!! code location !!", get_line_no(), function()
-        local tree = nomsu.compilestack[#nomsu.compilestack - 1]
-        return LuaValue(tree.source, repr(tostring(tree.source)))
+      self:define_compile_action("!! code location !!", get_line_no(), function(self)
+        return LuaValue(self.source, repr(self.source))
       end)
       self:define_action("run file %filename", get_line_no(), function(_filename)
         return nomsu:run_file(_filename)
       end)
-      return self:define_compile_action("use %filename", get_line_no(), function(_filename)
-        local tree = nomsu.compilestack[#nomsu.compilestack - 1]
+      return self:define_compile_action("use %filename", get_line_no(), function(self, _filename)
         local filename = nomsu:tree_to_value(_filename)
         nomsu:use_file(filename)
-        return LuaValue(tree.source, "nomsu:use_file(" .. tostring(repr(filename)) .. ")")
+        return LuaValue(self.source, "nomsu:use_file(" .. tostring(repr(filename)) .. ")")
       end)
     end
   }
diff --git a/nomsu.moon b/nomsu.moon
index 5c24430..e840fb3 100755
--- a/nomsu.moon
+++ b/nomsu.moon
@@ -36,6 +36,7 @@ debug_getinfo = debug.getinfo
 -- Add a ((%x foo %y) where {x:"asdf", y:"fdsa"}) compile-time action for substitution
 -- Allow plain text backslash like: "\n" in longstrings without requiring "\\n"
 
+export FILE_CACHE
 FILE_CACHE = setmetatable {}, {
     __index: (filename)=>
         file = io.open(filename)
@@ -149,7 +150,7 @@ NOMSU_DEFS = with {}
         if lpeg.userdata.source_code\sub(pos,pos)\match("[\r\n]")
             pos += #lpeg.userdata.source_code\match("[ \t\n\r]*", pos)
         line_no = 1
-        text_loc = Location(lpeg.userdata.filename, src, pos)
+        text_loc = Location(lpeg.userdata.filename, pos)
         line_no = text_loc\get_line_number!
         prev_line = src\sub(LINE_STARTS[src][line_no-1] or 1, LINE_STARTS[src][line_no]-1)
         err_line = src\sub(LINE_STARTS[src][line_no], (LINE_STARTS[src][line_no+1] or 0)-1)
@@ -162,7 +163,7 @@ NOMSU_DEFS = with {}
 setmetatable(NOMSU_DEFS, {__index:(key)=>
     make_node = (start, value, stop)->
         if type(value) == 'table' then error("Not a tuple: #{repr value}")-- = Tuple(value)
-        loc = Location(lpeg.userdata.filename, lpeg.userdata.source_code, start, stop)
+        loc = Location(lpeg.userdata.filename, start, stop)
         node = Types[key](value, loc)
         return node
     self[key] = make_node
@@ -247,8 +248,8 @@ class NomsuCompiler
             unless fn_info.isvararg
                 arg_positions = [fn_arg_positions[a] for a in *args]
                 -- TODO: better error checking?
-                if #arg_positions != #args
-                    error("Mismatch in args between lua function's #{repr fn_arg_positions} and stub's #{repr args} for #{repr stub}", 0)
+                --if #arg_positions != #args
+                --    error("Mismatch in args between lua function's #{repr fn_arg_positions} and stub's #{repr args} for #{repr stub}", 0)
                 arg_orders[stub] = arg_positions
         
         @action_metadata[fn] = {
@@ -304,7 +305,8 @@ class NomsuCompiler
         tree = @parse(nomsu_code, filename)
         assert tree, "Failed to parse: #{nomsu_code}"
         assert tree.type == "File", "Attempt to run non-file: #{tree.type}"
-        lua = @tree_to_lua(tree)\as_statements!\with_locals_declared!
+        lua = @tree_to_lua(tree)\as_statements!
+        lua\declare_locals!
         lua\prepend "-- File: #{filename}\n"
         return @run_lua(lua, filename..".lua")
 
@@ -353,7 +355,8 @@ class NomsuCompiler
                 _chunk_counter += 1
                 "<lua chunk ##{_chunk_counter}>"
             else
-                lua.source.text_name..".lua"
+                lua.source.filename..".lua"
+            FILE_CACHE[filename] = tostring(lua)
         if type(lua) != 'string'
             lua, metadata = lua\make_offset_table(filename)
             LUA_METADATA[lua] = metadata
@@ -373,7 +376,7 @@ class NomsuCompiler
         if tree.type == 'Text' and #tree.value == 1 and type(tree.value[1]) == 'string'
             return tree.value[1]
         lua = Lua(tree.source, "return ",@tree_to_lua(tree),";")
-        return @run_lua(lua, tree.source.text_name)
+        return @run_lua(lua, tree.source.filename)
 
     tree_to_nomsu: (tree, indentation="", max_line=80, expr_type=nil)=>
         -- Convert a tree into nomsu code that satisfies the max line requirement or nil
@@ -659,11 +662,11 @@ class NomsuCompiler
                 return file_lua
             
             when "Comment"
-                return Lua(tree.source, "--"..tree.value\gsub("\n","\n--"))
+                return Lua(tree.source, "--"..tree.value\gsub("\n","\n--").."\n")
             
             when "Nomsu"
                 --return Lua(tree.source, repr(tree.value))
-                return Lua(tree.source, "nomsu:parse(",tree.source\get_text!,", ",repr(tree.source.text_name),")")
+                return Lua(tree.source, "nomsu:parse(",tree.source\get_text!,", ",repr(tree.source.filename),")")
 
             when "Block"
                 block_lua = Lua(tree.source)
@@ -688,9 +691,9 @@ class NomsuCompiler
                     args = [arg for arg in *tree.value when arg.type != "Word"]
                     -- Force all compile-time actions to take a tree location
                     if metadata and metadata.arg_orders
-                        new_args = [args[p] for p in *metadata.arg_orders[stub]]
+                        new_args = [args[p-1] for p in *metadata.arg_orders[stub]]
                         args = new_args
-                    lua = action(unpack(args))
+                    lua = action(tree, unpack(args))
                     remove @compilestack
                     return lua
                 elseif not metadata and @@math_patt\match(stub)
@@ -1005,15 +1008,51 @@ class NomsuCompiler
         -- Sets up some core functionality
         get_line_no = -> "nomsu.moon:#{debug_getinfo(2).currentline}"
         nomsu = self
-        @define_compile_action "immediately %block", get_line_no!, (_block)->
+        @define_compile_action "immediately %block", get_line_no!, (_block)=>
             lua = nomsu\tree_to_lua(_block)\as_statements!
             lua\declare_locals!
             nomsu\run_lua(lua)
-            return Lua(_block.source, "if IMMEDIATE then\n", lua, "\nend")
+            return Lua(@source, "if IMMEDIATE then\n", lua, "\nend")
 
-        @define_compile_action "lua> %code", get_line_no!, (_code)->
+        @define_compile_action "Lua %code", get_line_no!, (_code)=>
             if _code.type != "Text"
-                return LuaValue(_code.source, "nomsu:run_lua(",nomsu\tree_to_lua(_code),")")
+                return LuaValue(@source, "Lua(", repr(_code.source),", ",nomsu\tree_to_lua(_code),")")
+
+            lua = LuaValue(@source, "Lua(", repr(_code.source))
+            for bit in *_code.value
+                lua\append ", "
+                if type(bit) == "string"
+                    lua\append repr(bit)
+                else
+                    bit_lua = nomsu\tree_to_lua bit
+                    unless bit_lua.is_value
+                        line, src = bit.source\get_line!, bit.source\get_text!
+                        error "#{line}: Cannot use #{colored.yellow src} as a string interpolation value, since it's not an expression.", 0
+                    lua\append bit_lua
+            lua\append ")"
+            return lua
+
+        @define_compile_action "LuaValue %code", get_line_no!, (_code)=>
+            if _code.type != "Text"
+                return LuaValue(@source, "LuaValue(", repr(_code.source),", ",nomsu\tree_to_lua(_code),")")
+
+            lua = LuaValue(@source, "LuaValue(", repr(_code.source))
+            for bit in *_code.value
+                lua\append ", "
+                if type(bit) == "string"
+                    lua\append repr(bit)
+                else
+                    bit_lua = nomsu\tree_to_lua bit
+                    unless bit_lua.is_value
+                        line, src = bit.source\get_line!, bit.source\get_text!
+                        error "#{line}: Cannot use #{colored.yellow src} as a string interpolation value, since it's not an expression.", 0
+                    lua\append bit_lua
+            lua\append ")"
+            return lua
+
+        @define_compile_action "lua> %code", get_line_no!, (_code)=>
+            if _code.type != "Text"
+                return LuaValue(@source, "nomsu:run_lua(",nomsu\tree_to_lua(_code),")")
 
             lua = Lua(_code.source)
             for bit in *_code.value
@@ -1027,11 +1066,11 @@ class NomsuCompiler
                     lua\append bit_lua
             return lua
 
-        @define_compile_action "=lua %code", get_line_no!, (_code)->
+        @define_compile_action "=lua %code", get_line_no!, (_code)=>
             if _code.type != "Text"
-                return LuaValue(_code.source, "nomsu:run_lua(",nomsu\tree_to_lua(_code),")")
+                return LuaValue(@source, "nomsu:run_lua(",nomsu\tree_to_lua(_code),")")
 
-            lua = LuaValue(_code.source)
+            lua = LuaValue(@source)
             for bit in *_code.value
                 if type(bit) == "string"
                     lua\append bit
@@ -1043,18 +1082,16 @@ class NomsuCompiler
                     lua\append bit_lua
             return lua
 
-        @define_compile_action "!! code location !!", get_line_no!, ->
-            tree = nomsu.compilestack[#nomsu.compilestack-1]
-            return LuaValue(tree.source, repr(tostring(tree.source)))
+        @define_compile_action "!! code location !!", get_line_no!, =>
+            return LuaValue(@source, repr(@source))
 
         @define_action "run file %filename", get_line_no!, (_filename)->
             return nomsu\run_file(_filename)
 
-        @define_compile_action "use %filename", get_line_no!, (_filename)->
-            tree = nomsu.compilestack[#nomsu.compilestack-1]
+        @define_compile_action "use %filename", get_line_no!, (_filename)=>
             filename = nomsu\tree_to_value(_filename)
             nomsu\use_file(filename)
-            return LuaValue(tree.source, "nomsu:use_file(#{repr filename})")
+            return LuaValue(@source, "nomsu:use_file(#{repr filename})")
 
 -- Only run this code if this file was run directly with command line arguments, and not require()'d:
 if arg and debug_getinfo(2).func != require