test: nested semicolons fail lexing

[filmaj]

This one is a weird, but I'm also alarmed npm run test:unit exits with a 0 code even though the test fails. npx tape test/00-lexer-test.js correctly exits with a non-zero code. Perhaps tap-arc is swallowing up the errors when piped to?

In any case this demonstrates an issue with the parser semi-colons are present (or, in the case of https://github.com/architect/architect/issues/1430, preferences.arc files).