* module/mes/base.mes (closure_p, mes_car, mes_cdr): New function.
(pair_p): Closure is not a pair.
* NEWS: Mention it.
* psyntax-0.mes (self-evaluating?): Add closure?.
* mes.c (function_t): New struct.
(type): One type for function.
(call): Refactor.
* build-aux/mes-snarf.mes: Use arity annotation. WAS: args. Update
annotations.
* mes.c (char_p, macro_p, number_p, pair_p, string_p, symbol_p,
vector_p, builtin_p, boolean_p): Move to type.c
* type.c: New file.
* GNUmakefile (mes.o): Depend on type snarf output.
* module/mes/loop-0.mes (cond, map, let, or, and not, evlis-env,
apply-env, eval-expand, uquote, add-unquoters, eval,
expand-macro-env, eval-begin-env, eval-if-env, sexp:define,
env:define, env:macro): Move to mes-0.mes.
* module/mes/mes-0.mes: New file.
* module/mes/type-0.mes: New file.
* scripts/include.mes: If BOOT, also include mes-0.mes. If TYPE0,
also include type-0.mes.