merge revision(s) dc146babf47a84bbd1f176d766637d4a40327019, f23d5028059078a346efc977287b669d494a5a3f, a0f7de814ae5c299d6ce99bed5fb308a05d50ba0: [Backport #20296]

	[Bug #20296] Clear errinfo when `exception: false`

	[Bug #20296] Refine the test

	[Bug #20296] Fix the default assertion message

1 files changed, 5 insertions, 2 deletions

diff --git a/complex.c b/complex.c
index 57962f9013..a227cb0a58 100644
--- a/complex.c
+++ b/complex.c
@@ -2116,8 +2116,11 @@ nucomp_convert(VALUE klass, VALUE a1, VALUE a2, int raise)
             return a1;
         /* should raise exception for consistency */
         if (!k_numeric_p(a1)) {
-            if (!raise)
-                return rb_protect(to_complex, a1, NULL);
+            if (!raise) {
+                a1 = rb_protect(to_complex, a1, NULL);
+                rb_set_errinfo(Qnil);
+                return a1;
+            }
             return to_complex(a1);
         }
     }