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\DOC write_env
\TYPE {write_env : string -> void}
\KEYWORDS
proof recording.
\LIBRARY
record_proof
\SYNOPSIS
Output the current proof environment to a port.
\DESCRIBE
A proof is a list of inference steps. The proof recorder records
every inference performed by the system in an internal buffer.
When a proof is completed, the raw records are converted into a list
of proof lines as in Hilbert's style proofs. These lines are then
output to a disk file. This file is in the {prf} format specified in
[1]. A proof is performed in an environment. It consists of a set of
type operators and a set of constants.
{write_env} is the output function for writing the current proof
environment to a
output port. The first argument is a string representing a port. It
should be the value returned by the system function {openw}.
\FAILURE
Never fail.
\COMMENTS
This function is used to implement higher level user functions for
recording proof in the library {record_proof}. It is much more
convenient to use those functions than this low level function directly.
\SEEALSO
write_thm_list, write_line,
write_proof_add_to, write_proof_to, write_last_proof,
current_proof, current_proof_file,
new_proof_file, close_proof_file, begin_proof, end_proof,
TAC_PROOF, PROVE, prove, prove_thm
\ENDDOC
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