mame	2017-09-14 11:53:54 +0900 (Thu, 14 Sep 2017)

  New Revision: 59875

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59875

  Log:
    ext/coverage/coverage.c: Fix the condition for non-experimental mode

  Modified files:
    trunk/ext/coverage/coverage.c
Index: ext/coverage/coverage.c
===================================================================
--- ext/coverage/coverage.c	(revision 59874)
+++ ext/coverage/coverage.c	(revision 59875)
@@ -30,7 +30,7 @@ rb_coverage_start(int argc, VALUE *argv, https://github.com/ruby/ruby/blob/trunk/ext/coverage/coverage.c#L30
         if (!e || !*e) experimental_mode_enabled = 0;
     }
 
-    if (!experimental_mode_enabled)
+    if (!experimental_mode_enabled && argc != 0)
 	rb_error_arity(argc, 0, 0);
     rb_scan_args(argc, argv, "01", &opt);
 

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