fix :eval minlen

Author: tyru

autoload/vimlparser.vim

@@ -2227,7 +2227,7 @@ let s:VimLParser.builtin_commands = [
       \ {'name': 'endtry', 'minlen': 4, 'flags': 'TRLBAR|SBOXOK|CMDWIN', 'parser': 'parse_cmd_endtry'},
       \ {'name': 'endwhile', 'minlen': 4, 'flags': 'TRLBAR|SBOXOK|CMDWIN', 'parser': 'parse_cmd_endwhile'},
       \ {'name': 'enew', 'minlen': 3, 'flags': 'BANG|TRLBAR', 'parser': 'parse_cmd_common'},
-      \ {'name': 'eval', 'minlen': 4, 'flags': 'EXTRA|NOTRLCOM|SBOXOK|CMDWIN', 'parser': 'parse_cmd_eval'},
+      \ {'name': 'eval', 'minlen': 2, 'flags': 'EXTRA|NOTRLCOM|SBOXOK|CMDWIN', 'parser': 'parse_cmd_eval'},
       \ {'name': 'ex', 'minlen': 2, 'flags': 'BANG|FILE1|EDITCMD|ARGOPT|TRLBAR', 'parser': 'parse_cmd_common'},
       \ {'name': 'execute', 'minlen': 3, 'flags': 'EXTRA|NOTRLCOM|SBOXOK|CMDWIN', 'parser': 'parse_cmd_execute'},
       \ {'name': 'exit', 'minlen': 3, 'flags': 'RANGE|WHOLEFOLD|BANG|FILE1|ARGOPT|DFLALL|TRLBAR|CMDWIN', 'parser': 'parse_cmd_common'},