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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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WIP
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This is like a 'select' that only changes the default value of a symbol,
not limiting what values the user can set it to (with one exception: A
symbol implied to 'y' can't be set to 'm').
Symbol.get_implied_symbols() was added, corresponding to
Symbol.get_selected_symbols(), and Symbol.__str__() was extended to
print implied symbols and weak reverse dependencies. Weak reverse
dependencies are the 'imply' version of 'select's reverse dependencies.
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Also sneak in testing of env. variable expansion, named choices, and
'base_dir'.
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