More fun with predicate hoisting:
grammar Simple;
FOO : 'foo' ;
section : element* unrelated EOF ;
element : {P1}?=> pre;
pre : FOO post ;
post : FOO*;
unrelated : ':' post;
In this grammar, the generated code invokes P1
(completely outside its intended syntactic context)
while trying to recognize an "unrelated" (because P1 was
"hoisted downward" into "post", and "post" is reachable via
a nonterminal unrelated to "element").
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