module deduction can blow up; UTF BOM ignored

ldoc/doc.lua

@@ -410,6 +410,7 @@ function Item:set_tag (tag,value)
          value = value[1]
          modifiers = value.modifiers
       end
+      if value == nil then self:error("Tag without value: "..tag) end
       local id, rest = tools.extract_identifier(value)
       self.tags[tag] = id
       self:add_to_description(rest)

ldoc/lexer.lua

@@ -172,6 +172,9 @@ function lexer.scan (s,matches,filter,options)
     if file then
         s = file:read()
         if not s then return nil end -- empty file
+        if s:match '^\239\187' then -- UTF-8 BOM Abomination
+           s = s:sub(4)
+         end
         s = s ..'\n'
      end
     local sz = #s

ldoc/parse.lua

@@ -211,7 +211,7 @@ local function parse_file(fname, lang, package, args)
       else
          mod,t,v = lang:parse_module_call(tok,t,v)
          if mod ~= '...' then
-            add_module({summary='(no description)'},mod,true)
+            add_module(Tags.new{summary='(no description)'},mod,true)
             first_comment = false
             module_found = true
          end