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These are easiest to check after parsing, since a symbol/choice can be
defined in multiple locations:
- Warn if a symbol or choice defined without a type. Also warn for
choice value symbols defined without a type, even if they
automatically get their type from the choice. This feature isn't
well-known and probably not used deliberately.
- Warn if a choice is defined without a prompt
- Warn of a choice default symbol is not contained in the choice
Also move _name_and_loc_str() from the symbol class to the global scope
and generalize it to be able to handle choices.
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