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travis-ci

[[FIX]] Avoid crash when peeking past end of prog

The internal `peek` function may be used to request tokens beyond the
end of the program. Because multiple call sites expect the function to
consistently return an object value, the "end of program" token is be
returned in these cases.

However, this situation may occur in cases where the "end of program"
token is not the next token. The previous implementation of the function
would produce the `null` value in this event, violating callers'
expectation and resulting in runtime reference errors.

Update the internal `peek` function to consistently return the "end of
program" token when input has been exhausted--even when this is not the
next token.

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