symbol.c: more informative error message

* symbol.c (sym_check_asciionly): more informative error message
  with the encoding name and the inspected content.
  [ruby-core:73398] [Feature #12016]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53650 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/symbol.c b/symbol.c
index 8e3e0c3c55..b37be2f65b 100644
--- a/symbol.c
+++ b/symbol.c
@@ -430,7 +430,8 @@ sym_check_asciionly(VALUE str)
     if (!rb_enc_asciicompat(rb_enc_get(str))) return FALSE;
     switch (rb_enc_str_coderange(str)) {
       case ENC_CODERANGE_BROKEN:
-	rb_raise(rb_eEncodingError, "invalid encoding symbol");
+	rb_raise(rb_eEncodingError, "invalid symbol in encoding %s :%+"PRIsVALUE,
+		 rb_enc_name(rb_enc_get(str)), str);
       case ENC_CODERANGE_7BIT:
 	return TRUE;
     }