nobu	2018-10-16 18:11:12 +0900 (Tue, 16 Oct 2018)

  New Revision: 65096

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65096

  Log:
    string.c: grapheme cluster regexp failure
    
    * string.c (get_reg_grapheme_cluster): show error info and relax
      to rb_fatal from rb_bug.

  Modified files:
    trunk/string.c
Index: string.c
===================================================================
--- string.c	(revision 65095)
+++ string.c	(revision 65096)
@@ -8428,10 +8428,13 @@ get_reg_grapheme_cluster(rb_encoding *en https://github.com/ruby/ruby/blob/trunk/string.c#L8428
     }
     if (!reg_grapheme_cluster) {
 	const OnigUChar source[] = "\\X";
+        OnigErrorInfo einfo;
 	int r = onig_new(&reg_grapheme_cluster, source, source + sizeof(source) - 1,
-			 ONIG_OPTION_DEFAULT, enc, OnigDefaultSyntax, NULL);
+                         ONIG_OPTION_DEFAULT, enc, OnigDefaultSyntax, &einfo);
 	if (r) {
-	    rb_bug("cannot compile grapheme cluster regexp");
+            UChar message[ONIG_MAX_ERROR_MESSAGE_LEN];
+            onig_error_code_to_str(message, r, &einfo);
+            rb_fatal("cannot compile grapheme cluster regexp: %s", (char *)message);
 	}
 	if (encidx == rb_utf8_encindex()) {
 	    reg_grapheme_cluster_utf8 = reg_grapheme_cluster;

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