lint on-the-fly didn't work

[firekeep]

Checklist

• Check that you have the GNU C Compiler installed by typing gcc --version into a terminal.
• If you don't have the linter package installed, either update to the latest version of linter-gcc or install linter directly with apm install linter.
• Ensure that you are using a valid grammar - either C/C++/C++14
• Ensure that you have read all the relevant information in the wiki, particularly the Common Issues page.

Issue (including debugging messages):

[Lavenderloved]

There is a obvious error in the line 4,but there are no tips showing that I am wrong.