Honestly not trying to be a brat here, but I do this a lot myself, and I'm no Ken. Sometimes sitting back and just examining the symptoms of a bug can help narrow down the context that it was likely to have arose from (if you know the code base well enough). I often find that firing up the debugger tends to lead down tangential rabbit holes, particularly when dealing with a heavy framework.

That said, a REPL would be nice. Seems like go compiles fast enough that some ambitious dork could make a REPL-faker?