Fix a crash reporting an error on the first line.

haberman · Feb 3, 2009 · d94b86d · d94b86d
1 parent e17978c
commit d94b86d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/compiler/bootstrap/rtn.lua b/compiler/bootstrap/rtn.lua
@@ -72,7 +72,7 @@ CharStream = {}
       local lineno = 1
       for nl in self.string:sub(0, self.offset):gmatch("[\n\r]") do lineno = lineno + 1 end
       local first, last = self.string:sub(0, self.offset):find(".*[\n\r]")
-      local colno = self.offset - last
+      local colno = self.offset - (last or 0)
       error(string.format("Error parsing grammar %s:\nat line %s, column %s expected '%s', got '%s'", input_filename, lineno, colno, str, actual_str))
     end
     self.offset = self.offset + str:len()