nobu	2016-04-20 11:52:07 +0900 (Wed, 20 Apr 2016)

  New Revision: 54652

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=54652

  Log:
    compile.c: make SyntaxError after formatting
    
    * compile.c (append_compile_error): make SyntaxError instance by
      rb_syntax_error_append on demand after formatting the message.

  Modified files:
    trunk/compile.c
Index: compile.c
===================================================================
--- compile.c	(revision 54651)
+++ compile.c	(revision 54652)
@@ -319,11 +319,16 @@ append_compile_error(rb_iseq_t *iseq, in https://github.com/ruby/ruby/blob/trunk/compile.c#L319
 {
     VALUE err_info = ISEQ_COMPILE_DATA(iseq)->err_info;
     VALUE file = iseq->body->location.path;
+    VALUE err = err_info;
     va_list args;
 
     va_start(args, fmt);
-    rb_syntax_error_append(err_info, file, line, -1, NULL, fmt, args);
+    err = rb_syntax_error_append(err, file, line, -1, NULL, fmt, args);
     va_end(args);
+    if (NIL_P(err_info)) {
+	RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, err);
+	rb_set_errinfo(err);
+    }
 }
 
 static void
@@ -341,13 +346,7 @@ NOINLINE(static compile_error_func prepa https://github.com/ruby/ruby/blob/trunk/compile.c#L346
 static compile_error_func
 prepare_compile_error(rb_iseq_t *iseq)
 {
-    VALUE err_info = ISEQ_COMPILE_DATA(iseq)->err_info;
     if (compile_debug) return &compile_bug;
-    if (NIL_P(err_info)) {
-	err_info = rb_exc_new_cstr(rb_eSyntaxError, "");
-	RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, err_info);
-    }
-    rb_set_errinfo(err_info);
     return &append_compile_error;
 }
 

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