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In our example, we would want the following declarations:
verb(
%left '<'
%left '-'
%left '*'
)
In a more complete example, which supports other operators as well, we
would declare them in groups of equal precedence. For example, 'tt(+)' is
declared with 'tt(-)':
verb(
%left '<' '>' '=' NE LE GE
%left '+' '-'
%left '*' '/'
)
(Here tt(NE) and so on stand for the operators for `not equal' and so
on. We assume that these tokens are more than one character long and therefore
are represented by names, not character literals.)
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