* test-suite/tests/srfi-64-test.scm: Skip a couple of tests that have
unspecified result due to eq? being unspecified on procedures.
* module/language/tree-il/letrectify.scm (letrectify): Add a comment.
* doc/ref/api-modules.texi (Declarative Modules): New subsection.
* module/ice-9/boot-9.scm (module): Change eval-closure slot, which was
deprecated and unused, to be a "declarative?" slot, indicating that
definitions from the module are declarative.
(user-modules-declarative?): New parameter.
(make-fresh-user-module): Set declarative according to parameter.
(define-module*, define-module): Add #:declarative? keyword argument,
defaulting to the value of user-modules-declarative? parameter when
the module was expanded.
(guile-user): This module is not declarative.
* module/language/tree-il/letrectify.scm (compute-declarative-toplevels):
Use the new declarative? module flag.
* module/language/tree-il/letrectify.scm: New pass, not wired up yet.
Adds lexical definitions for declarative top-level definitions, for
better inlining and contification within a compilation unit.
* am/bootstrap.am:
* module/Makefile.am: Add to build.
