mycroft a5381ee7f4 There were several places where m4 did not conform to the specification
in `The M4 Macro Processor', by Kernighan and Ritchie.

* `|' and `||' are both logical or.  There is no binary or.
* `&' and `&&' are both logical and.  There is no binary and.
* `!' has a much higher precedence.
* The equal and relation operators have the same precedence.
* `**' is implemented, and `^' is for exponentation (not xor).
* Unary `+' in implemented.

I've coded exponentiation to return what appears to be the same results
that other versions of m4 return.
1995-04-14 23:10:25 +00:00
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