regcomp.c: Add assertion

diff --git a/regcomp.c b/regcomp.c
index 595fc6f..f9bf717 100644 (file)
--- a/regcomp.c
+++ b/regcomp.c
@@ -10455,6 +10455,7 @@ parseit:
                    U8 dummy[UTF8_MAXBYTES+1];
                    STRLEN dummy_len;
                    to_utf8_fold((U8*) "A", dummy, &dummy_len);
+                   assert(PL_utf8_tofold); /* Verify that worked */
                }
                PL_utf8_foldclosures = _swash_inversion_hash(PL_utf8_tofold);
            }