GrandFather gets the cigar - along with everyone else who told me that it couldn't be the same file. When I followed his advice and stopped trusting the IDE, and went back to the terminal, it was obvious. That explains why I wasn't seeing the compilation errors, even when I "asked for them."

I hunted down the files that were getting loaded, moved them to my working directory, and made sure the IDE was pointing to them. Now I'm getting lots of reassuring syntax errors.

My lesson: It's not true laziness to depend on the IDE. When in doubt, drop to the command line and make sure you really know whats going on.

Thanks Folks!