nobu	2018-08-03 15:31:22 +0900 (Fri, 03 Aug 2018)

  New Revision: 64167

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64167

  Log:
    random.c: endless range random
    
    * random.c (range_values): cannot determine the domain of an endless
      range.  [ruby-core:88261] [Bug #14958]

  Modified files:
    trunk/random.c
    trunk/test/ruby/test_rand.rb
Index: test/ruby/test_rand.rb
===================================================================
--- test/ruby/test_rand.rb	(revision 64166)
+++ test/ruby/test_rand.rb	(revision 64167)
@@ -399,6 +399,7 @@ END https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rand.rb#L399
 
     assert_raise(Errno::EDOM, Errno::ERANGE) { r.rand(1.0 / 0.0) }
     assert_raise(Errno::EDOM, Errno::ERANGE) { r.rand(0.0 / 0.0) }
+    assert_raise(Errno::EDOM) {r.rand(1..)}
 
     r = Random.new(0)
     assert_in_delta(1.5488135039273248, r.rand(1.0...2.0), 0.0001, '[ruby-core:24655]')
Index: random.c
===================================================================
--- random.c	(revision 64166)
+++ random.c	(revision 64167)
@@ -302,6 +302,7 @@ VALUE rb_cRandom; https://github.com/ruby/ruby/blob/trunk/random.c#L302
 #define id_minus '-'
 #define id_plus  '+'
 static ID id_rand, id_bytes;
+NORETURN(static void domain_error(void));
 
 /* :nodoc: */
 static void
@@ -1163,6 +1164,7 @@ range_values(VALUE vmax, VALUE *begp, VA https://github.com/ruby/ruby/blob/trunk/random.c#L1164
 
     if (!rb_range_values(vmax, begp, &end, exclp)) return Qfalse;
     if (endp) *endp = end;
+    if (NIL_P(end)) domain_error();
     if (!rb_respond_to(end, id_minus)) return Qfalse;
     r = rb_funcallv(end, id_minus, 1, begp);
     if (NIL_P(r)) return Qfalse;
@@ -1205,7 +1207,6 @@ rand_int(VALUE obj, rb_random_t *rnd, VA https://github.com/ruby/ruby/blob/trunk/random.c#L1207
     }
 }
 
-NORETURN(static void domain_error(void));
 static void
 domain_error(void)
 {

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