Arguments are collected if a macro name is "immediately" followed by a left parenthesis. Experiment shows that arguments are not collected when a macro name occurs at the end of a file (without a following newline) and the next input file begins with a left parenthesis. I believe this behavior is incorrect.
However, the underlying error lies not with m4, but with the input file. According to POSIX, a valid nonempty text file must end with a newline. Other experiment suggests that m4 silently appends a missing newline. Should it not warn when it does so? Doug
