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Check for valid "rest" parameters in parameter lists

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Checks for invalid parameter names and duplicate parameters were
being performed on parameter lists, but these checks were not
considering any rest parameters.  This means that

  ((lambda (x . x) x) 'foo 'bar)   =>  foo
  ((lambda (x . 0) x) 'foo 'bar)   =>  foo
  ((lambda (x . #t) x) 'foo 'bar)  =>  foo
  ((lambda 0 'foo))                =>  foo
  ((lambda #t 'foo))               =>  foo

and so on.  Now these all produce errors.
This commit is contained in:
Kris Katterjohn 2018-03-28 21:11:33 -05:00
parent d0b63109e8
commit 439e35da61
1 changed files with 6 additions and 0 deletions
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6
eval.c
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@ -806,6 +806,12 @@ static sexp analyze_lambda (sexp ctx, sexp x, int depth) {
sexp_return(res, sexp_compile_error(ctx, "non-symbol parameter", x));
else if (sexp_truep(sexp_memq(ctx, sexp_car(ls), sexp_cdr(ls))))
sexp_return(res, sexp_compile_error(ctx, "duplicate parameter", x));
if (! sexp_nullp(ls)) {
if (! sexp_idp(ls))
sexp_return(res, sexp_compile_error(ctx, "non-symbol parameter", x));
else if (sexp_truep(sexp_memq(ctx, ls, sexp_cadr(x))))
sexp_return(res, sexp_compile_error(ctx, "duplicate parameter", x));
}
/* build lambda and analyze body */
res = sexp_make_lambda(ctx, tmp=sexp_copy_list(ctx, sexp_cadr(x)));
if (sexp_exceptionp(res)) sexp_return(res, res);