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-rw-r--r--libguile/memoize.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/libguile/memoize.c b/libguile/memoize.c
index 584096fbd..dfbeea781 100644
--- a/libguile/memoize.c
+++ b/libguile/memoize.c
@@ -269,14 +269,33 @@ memoize (SCM exp, SCM env)
return MAKMEMO_BEGIN (memoize_exps (REF (exp, SEQUENCE, EXPS), env));
case SCM_EXPANDED_LAMBDA:
- /* The body will be a lambda-case. */
+ /* The body will be a lambda-case or #f. */
{
- SCM meta, docstring, proc;
+ SCM meta, docstring, body, proc;
meta = REF (exp, LAMBDA, META);
docstring = scm_assoc_ref (meta, scm_sym_documentation);
- proc = memoize (REF (exp, LAMBDA, BODY), env);
+ body = REF (exp, LAMBDA, BODY);
+ if (scm_is_false (body))
+ /* Give a body to case-lambda with no clauses. */
+ proc = MAKMEMO_LAMBDA
+ (MAKMEMO_CALL
+ (MAKMEMO_MOD_REF (list_of_guile,
+ scm_from_latin1_symbol ("throw"),
+ SCM_BOOL_F),
+ 5,
+ scm_list_5 (MAKMEMO_QUOTE (scm_args_number_key),
+ MAKMEMO_QUOTE (SCM_BOOL_F),
+ MAKMEMO_QUOTE (scm_from_latin1_string
+ ("Wrong number of arguments")),
+ MAKMEMO_QUOTE (SCM_EOL),
+ MAKMEMO_QUOTE (SCM_BOOL_F))),
+ FIXED_ARITY (0),
+ SCM_BOOL_F /* docstring */);
+ else
+ proc = memoize (body, env);
+
if (scm_is_string (docstring))
{
SCM args = SCM_MEMOIZED_ARGS (proc);