Yes. Just don't put the first item on the first line.
locations = [ a, b, c, d ]
Yeah, I've raised this before. The white-space handling in Adventuron is a bit weird. As Chris knows, I have trouble with Ctrl+Space working. The hinting and auto-completion shown in the videos doesn't work at all. The code suggestions don't work if there's an error and often don't work unless the cursor is on a blank line. And the syntax colouring doesn't work properly if the opening curly bracket '{' following key words is on a new line.