error.c: fix newline in syntax error

* error.c (rb_syntax_error_append): fix newline in syntax error
  message to the beginning, not after file name and line number.
  [Feature #11951]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55878 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 3 deletions

diff --git a/error.c b/error.c
index 27ca7db8d2..bb10e295af 100644
--- a/error.c
+++ b/error.c
@@ -106,16 +106,16 @@ rb_syntax_error_append(VALUE exc, VALUE file, int line, int column,
     }
     else {
 	VALUE mesg;
-	const char *pre = NULL;
 	if (NIL_P(exc)) {
 	    mesg = rb_enc_str_new(0, 0, enc);
 	    exc = rb_class_new_instance(1, &mesg, rb_eSyntaxError);
 	}
 	else {
 	    mesg = rb_attr_get(exc, idMesg);
-	    pre = "\n";
+	    if (RSTRING_LEN(mesg) > 0 && *(RSTRING_END(mesg)-1) != '\n')
+		rb_str_cat_cstr(mesg, "\n");
 	}
-	err_vcatf(mesg, pre, fn, line, fmt, args);
+	err_vcatf(mesg, NULL, fn, line, fmt, args);
     }
 
     return exc;