* module/system/base/compile.scm (<cenv>): No more cenv, it was a useless
data structure.
* module/system/repl/command.scm (*command-table*): Remove `use', it's
the same as `import'. Otherwise in this file, adapt to the repl having
direct pointers to the vm and the language, and to the module being in
the current-module fluid.
* module/system/repl/repl.scm (prompting-meta-read):
* module/system/repl/common.scm (<repl>): The repl now has a direct
pointer to the vm and language. Adapt accordingly.
* module/system/repl/common.scm (repl-prompt): Return a string instead of
outputting to the port, for better readline integration.
* module/system/repl/repl.scm (meta-reader, prompting-meta-read)
(start-repl): Integrate with (ice-9 readline) via the current-reader
fluid and the repl-reader function, both from boot-9.scm.
* module/system/base/syntax.scm (define-record): Rework to separate the
type and its constructor. Now (define-record (<foo> bar)) will create
`make-foo' as the constructor, not `<foo>'. Also the constructor now
takes either keyword or positional arguments, so that it can be used as
the implementation of variant types as well.
(|): Map directly to define-record instead of rolling our own thing.
* module/language/scheme/translate.scm:
* module/system/base/language.scm:
* module/system/il/compile.scm:
* module/system/il/ghil.scm:
* module/system/il/glil.scm:
* module/system/repl/common.scm:
* module/system/vm/assemble.scm:
* module/system/vm/debug.scm: Change instances of record creation to use
the make-foo procedures instead of <foo>. Adjust module exports as
necessary.
