Ah, I get what you mean. I think we should print a bare word error if the
expanded string does not start with a digit. This makes it similar to what
`%{expr:...}` and `%if` does:
```
$ ./rpm --define "aaa a" --define "bbb 123b" --eval '%{expr: %aaa }'
error: bare words are no longer supported, please use "...": a
error: ^
$ ./rpm --define "aaa a" --define "bbb 123b" --eval '%[ %aaa ]'
error: macro expansion returned a bare word, please use "...": %aaa
error: ^
error: expanded string: a
$ ./rpm --define "aaa a" --define "bbb 123b" --eval '%[ %bbb ]'
error: macro expansion did not return an integer: %bbb
error: ^
error: expanded string: 123b
```
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