Thanks to the "instant error analysis", we can see many error almost in real time as we type, but sometimes I change many files at once and use the "Save All" button and miss some errors that change caused.

So, just let me have a dialog box warning me every time I ask to save a file with parse errors.

There is that thin column at the right of the IDE where we can see that small red sign indicating that a parse error has been found. I suggest that this column should be positioned on the left site, where most of our code is. That would make it more visible.