The quick fixes can be accesses by clicking on an error marker . This opens a popup menu, which provides several fixes, as shown in the screenshot.
The quick fixes, proposed by Euklas, use three different icons:
Selecting a quick fix of the first category will copy additional code from the source file into your code to fix the error. Selecting a quick fix of the second category will show you how to fix this kind of errors manually. Selecting a ‘quick fix’ of the third category will ignore the error, but not fix it.