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5a8373c6b9
When BufferedFile.can_read_line() was invoked on files with no newlines, t incorrectly returned a false result for this single line that, even though doesn't finish with a newline character, is still a line. Since this method is usually used in tandem with read_line(), users would miss reading this line (and hence all the file contents). This commit fixes this corner case by adding another check after a negative result from finding a newline character. This new check does the same as the check that is done *before* looking for newlines, which takes care of this problem, but only works for files that have at least one newline (hence the buffer has already been filled). A new unit test has been added that shows the use case. Without the changes in this commit the test fails, which is a testament that this commit really fixes the underlying issue.