create two entries in posmap for multi-line lines

moonscript/compile.lua

@@ -61,6 +61,7 @@ do
         local _exp_0 = mtype(l)
         if "string" == _exp_0 or DelayedLine == _exp_0 then
           line_no = line_no + 1
+          out[line_no] = posmap[i]
           for _ in l:gmatch("\n") do
             line_no = line_no + 1
           end

moonscript/compile.moon

@@ -44,6 +44,8 @@ class Lines
       switch mtype l
         when "string", DelayedLine
           line_no += 1
+          out[line_no] = posmap[i]
+
           line_no += 1 for _ in l\gmatch"\n"
           out[line_no] = posmap[i]
         when Lines