Fix the first diagnostic first

A missing bracket can produce dozens of later parser/semantic errors. Work top-down:

1. Compile in Zen Studio Live.

2. Go to the first diagnostic location.

3. Inspect that line and the line immediately before it.

4. Make one small correction.

5. Recompile before chasing later messages.

The supplied complete diagnostic catalog documents all 166 known codes with messages, causes, and fixes.