[Flow] Adding an interface leads to "Execution of subprocess failed with exit code 255 and no output"

[Christian Eßl]

Now that I looks closer at it, regardless of what kind of syntax error I write in php (for instance just omitting a ; at the end of a line), I always get this vague error "Execution of subprocess failed with exit code 255 and no output" as described in my previous post, that doesn't give any informatoin about the error itself, which makes debugging an application quite difficult. 

I am in Development Context (FLOW_CONTEXT='Development' as shown in the compile error), so I assume, this kind of error handling normally shouldn't be happening?