Hi,
The "case is hygienic" test case in `syntax.test' looks suspicious to
me. Why would the fact that `else' is bound influence the syntax of
`case'?
For `cond', whether `else' and `=>' are bound does have an impact,
though. Perhaps those bits were copied from `cond'?
The relevant changes date back to 2003-10-11.
Thanks,
Ludovic.
--- orig/libguile/eval.c
+++ mod/libguile/eval.c
@@ -962,9 +962,6 @@
SCM clauses;
SCM all_labels = SCM_EOL;
- /* Check, whether 'else is a literal, i. e. not bound to a value. */
- const int else_literal_p = literal_p (scm_sym_else, env);
-
const SCM cdr_expr = SCM_CDR (expr);
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr);
@@ -994,7 +991,7 @@
}
else
{
- ASSERT_SYNTAX_2 (scm_is_eq (labels, scm_sym_else) && else_literal_p,
+ ASSERT_SYNTAX_2 (scm_is_eq (labels, scm_sym_else),
s_bad_case_labels, labels, expr);
ASSERT_SYNTAX_2 (scm_is_null (SCM_CDR (clauses)),
s_misplaced_else_clause, clause, expr);
--- orig/test-suite/tests/syntax.test
+++ mod/test-suite/tests/syntax.test
@@ -636,13 +636,6 @@
(pass-if "clause with empty labels list"
(case 1 (() #f) (else #t)))
- (with-test-prefix "case is hygienic"
-
- (pass-if-exception "bound 'else is handled correctly"
- exception:bad-case-labels
- (eval '(let ((else #f)) (case 1 (else #f)))
- (interaction-environment))))
-
(with-test-prefix "unmemoization"
(pass-if "normal clauses"
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