io.c: warn non-nil $,

* array.c (rb_ary_join_m): warn use of non-nil $,.

* io.c (rb_output_fs_setter): warn when set to non-nil value.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67606 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

array.c

@@ -2358,11 +2358,11 @@ rb_ary_join_m(int argc, VALUE *argv, VALUE ary)
 {
     VALUE sep;
 
-    if (rb_check_arity(argc, 0, 1) == 0) {
-        sep = rb_output_fs;
-    }
-    else if (NIL_P(sep = argv[0])) {
+    if (rb_check_arity(argc, 0, 1) == 0 || NIL_P(sep = argv[0])) {
         sep = rb_output_fs;
+        if (!NIL_P(sep)) {
+            rb_warn("$, is set to non-nil value");
+        }
     }
 
     return rb_ary_join(ary, sep);

io.c

@@ -7525,6 +7525,16 @@ rb_f_printf(int argc, VALUE *argv)
     return Qnil;
 }
 
+static void
+rb_output_fs_setter(VALUE val, ID id, VALUE *var)
+{
+    rb_str_setter(val, id, &val);
+    if (!NIL_P(val)) {
+        rb_warn("non-nil $, will be deprecated");
+    }
+    *var = val;
+}
+
 /*
  *  call-seq:
  *     ios.print               -> nil
@@ -13172,7 +13182,7 @@ Init_IO(void)
     rb_define_method(rb_cIO, "initialize", rb_io_initialize, -1);
 
     rb_output_fs = Qnil;
-    rb_define_hooked_variable("$,", &rb_output_fs, 0, rb_str_setter);
+    rb_define_hooked_variable("$,", &rb_output_fs, 0, rb_output_fs_setter);
 
     rb_default_rs = rb_fstring_lit("\n"); /* avoid modifying RS_default */
     rb_gc_register_mark_object(rb_default_rs);

spec/ruby/core/array/join_spec.rb

@@ -38,11 +38,13 @@ describe "Array#join with $," do
   end
 
   after :each do
-    $, = @before_separator
+    suppress_warning {$, = @before_separator}
   end
 
   it "separates elements with default separator when the passed separator is nil" do
-    $, = "_"
-    [1, 2, 3].join(nil).should == '1_2_3'
+    suppress_warning {
+      $, = "_"
+      [1, 2, 3].join(nil).should == '1_2_3'
+    }
   end
 end

spec/ruby/core/array/shared/join.rb

@@ -19,8 +19,10 @@ describe :array_join_with_default_separator, shared: true do
   end
 
   it "returns a string formed by concatenating each String element separated by $," do
-    $, = " | "
-    ["1", "2", "3"].send(@method).should == "1 | 2 | 3"
+    suppress_warning {
+      $, = " | "
+      ["1", "2", "3"].send(@method).should == "1 | 2 | 3"
+    }
   end
 
   it "attempts coercion via #to_str first" do

spec/ruby/core/kernel/p_spec.rb

@@ -7,7 +7,9 @@ describe "Kernel#p" do
   end
 
   after :each do
-    $/, $\, $, = @rs_f, @rs_b, @rs_c
+    suppress_warning {
+      $/, $\, $, = @rs_f, @rs_b, @rs_c
+    }
   end
 
   it "is a private method" do
@@ -50,7 +52,9 @@ describe "Kernel#p" do
     o = mock("Inspector Gadget")
     o.should_receive(:inspect).any_number_of_times.and_return "Next time, Gadget, NEXT TIME!"
 
-    $, = " *helicopter sound*\n"
+    suppress_warning {
+      $, = " *helicopter sound*\n"
+    }
     lambda { p(o) }.should output_to_fd("Next time, Gadget, NEXT TIME!\n")
 
     $\ = " *helicopter sound*\n"

spec/ruby/library/English/English_spec.rb

@@ -41,18 +41,18 @@ describe "English" do
 
   it "aliases $OFS to $," do
     original = $,
-    $, = "|"
+    suppress_warning {$, = "|"}
     $OFS.should_not be_nil
     $OFS.should == $,
-    $, = original
+    suppress_warning {$, = original}
   end
 
   it "aliases $OUTPUT_FIELD_SEPARATOR to $," do
     original = $,
-    $, = "|"
+    suppress_warning {$, = "|"}
     $OUTPUT_FIELD_SEPARATOR.should_not be_nil
     $OUTPUT_FIELD_SEPARATOR.should == $,
-    $, = original
+    suppress_warning {$, = original}
   end
 
   it "aliases $RS to $/" do

spec/ruby/optional/capi/globals_spec.rb

@@ -159,7 +159,7 @@ describe "CApiGlobalSpecs" do
     end
 
     after :each do
-      $, = @dollar_comma
+      suppress_warning {$, = @dollar_comma}
     end
 
     it "returns nil by default" do
@@ -167,7 +167,7 @@ describe "CApiGlobalSpecs" do
     end
 
     it "returns the value of $\\" do
-      $, = "foo"
+      suppress_warning {$, = "foo"}
       @f.rb_output_fs.should == "foo"
     end
   end

test/lib/with_different_ofs.rb

@@ -3,10 +3,14 @@ module DifferentOFS
   module WithDifferentOFS
     def setup
       super
+      verbose, $VERBOSE = $VERBOSE, nil
       @ofs, $, = $,, "-"
+      $VERBOSE = verbose
     end
     def teardown
+      verbose, $VERBOSE = $VERBOSE, nil
       $, = @ofs
+      $VERBOSE = verbose
       super
     end
   end

test/ruby/test_io.rb

@@ -2480,7 +2480,7 @@ class TestIO < Test::Unit::TestCase
   end
 
   def test_print_separators
-    $, = ':'
+    EnvUtil.suppress_warning {$, = ':'}
     $\ = "\n"
     pipe(proc do |w|
       w.print('a')