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-rw-r--r--encoding.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/encoding.c b/encoding.c
index ea00deb9e2..a8c04dcebf 100644
--- a/encoding.c
+++ b/encoding.c
@@ -504,7 +504,9 @@ rb_enc_check(VALUE str1, VALUE str2)
{
rb_encoding *enc = rb_enc_compatible(str1, str2);
if (!enc)
- rb_raise(rb_eArgError, "character encodings differ");
+ rb_raise(rb_eArgError, "character encodings differ: %s and %s",
+ rb_enc_name(rb_enc_get(str1)),
+ rb_enc_name(rb_enc_get(str2)));
return enc;
}