Dear all,

OCAMLRUNPARAM=p is a great help in debugging ocamlyacc parsers.
The only problem is, that once set, also the ocaml compiler
enters the parser debugging mode. 

Therefore I would like to suggest to provide a function in the
standard library that sets and clears the 'p' flag in
OCAMLRUNPARAM (more presicely, sets and clears the variable
parser_trace). 

Probably OCAMLRUNPARAM=b could also benefit from being accessable
from the standard library. 

Bye,

Hendrik
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