Returns the term net used to optimize access to default rewrites and
conversions.
DESCRIPTION
The HOL Light rewriter (REWRITE_TAC etc.) and simplifier (SIMP_TAC etc.)
have default sets of (conditional) equations and other conversions that are
applied by default, except in the PURE_ variants. Internally, these are
maintained in a term net (see enter and lookup for more information), and a
call to basic_net() returns that net.
FAILURE CONDITIONS
Never fails.
USES
Only useful for those who are delving deep into the implementation of
rewriting.