1 files changed, 4 insertions, 2 deletions
diff --git a/error.c b/error.c
index 5f8111df57..4398019b40 100644
--- a/error.c
+++ b/error.c
@@ -2719,8 +2719,10 @@ syntax_error_with_path(VALUE exc, VALUE path, VALUE *mesg, rb_encoding *enc)
         rb_ivar_set(exc, id_i_path, path);
     }
     else {
-        if (rb_attr_get(exc, id_i_path) != path) {
-            rb_raise(rb_eArgError, "SyntaxError#path changed");
+        VALUE old_path = rb_attr_get(exc, id_i_path);
+        if (old_path != path) {
+            rb_raise(rb_eArgError, "SyntaxError#path changed: %+"PRIsVALUE"->%+"PRIsVALUE,
+                     old_path, path);
         }
         VALUE s = *mesg = rb_attr_get(exc, idMesg);
         if (RSTRING_LEN(s) > 0 && *(RSTRING_END(s)-1) != '\n')