mame	2018-10-26 11:54:01 +0900 (Fri, 26 Oct 2018)

  New Revision: 65367

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65367

  Log:
    parse.y: remove "shadowing outer local variable" warning
    
    You can now write the following without warning.
    
      user = User.all.find {|user| cond(user) }
    
    Fixes [Feature #12490].

  Modified files:
    trunk/NEWS
    trunk/parse.y
    trunk/test/lib/test/unit/assertions.rb
    trunk/test/ripper/test_parser_events.rb
    trunk/test/ruby/test_parse.rb
    trunk/test/ruby/test_rubyoptions.rb
Index: NEWS
===================================================================
--- NEWS	(revision 65366)
+++ NEWS	(revision 65367)
@@ -31,6 +31,11 @@ sufficient information, see the ChangeLo https://github.com/ruby/ruby/blob/trunk/NEWS#L31
 
 * Non-Symbol key in keyword arguments hash causes an exception.
 
+* "shadowing outer local variable" warning was removed.  [Feature #12490]
+  You can now write the following without warning.
+
+  user = User.all.find {|user| cond(user) }
+
 === Core classes updates (outstanding ones only)
 
 [Array]
Index: parse.y
===================================================================
--- parse.y	(revision 65366)
+++ parse.y	(revision 65367)
@@ -9220,7 +9220,6 @@ shadowing_lvar_0(struct parser_params *p https://github.com/ruby/ruby/blob/trunk/parse.y#L9220
 	    yyerror0("duplicated argument name");
 	}
 	else if (dvar_defined(p, name) || local_id(p, name)) {
-	    rb_warning1("shadowing outer local variable - %"PRIsWARN, rb_id2str(name));
 	    vtable_add(p->lvtbl->vars, name);
 	    if (p->lvtbl->used) {
 		vtable_add(p->lvtbl->used, (ID)p->ruby_sourceline | LVAR_USED);
Index: test/ripper/test_parser_events.rb
===================================================================
--- test/ripper/test_parser_events.rb	(revision 65366)
+++ test/ripper/test_parser_events.rb	(revision 65367)
@@ -1487,13 +1487,6 @@ class TestRipper::ParserEvents < Test::U https://github.com/ruby/ruby/blob/trunk/test/ripper/test_parser_events.rb#L1487
     assert_equal("`$' without identifiers is not allowed as a global variable name", compile_error('$'))
   end
 
-  def test_warning_shadowing
-    fmt, *args = warning("x = 1; tap {|;x|}")
-    assert_match(/shadowing outer local variable/, fmt)
-    assert_equal("x", args[0])
-    assert_match(/x/, fmt % args)
-  end
-
   def test_warning_ignored_magic_comment
     fmt, *args = warning("1; #-*- frozen-string-literal: true -*-")
     assert_match(/ignored after any tokens/, fmt)
Index: test/lib/test/unit/assertions.rb
===================================================================
--- test/lib/test/unit/assertions.rb	(revision 65366)
+++ test/lib/test/unit/assertions.rb	(revision 65367)
@@ -693,6 +693,16 @@ eom https://github.com/ruby/ruby/blob/trunk/test/lib/test/unit/assertions.rb#L693
         assert_warning(*args) {$VERBOSE = false; yield}
       end
 
+      def assert_no_warning(pat, msg = nil)
+        stderr = EnvUtil.verbose_warning {
+          EnvUtil.with_default_internal(pat.encoding) {
+            yield
+          }
+        }
+        msg = message(msg) {diff pat, stderr}
+        refute(pat === stderr, msg)
+      end
+
       def assert_no_memory_leak(args, prepare, code, message=nil, limit: 2.0, rss: false, **opt)
         # TODO: consider choosing some appropriate limit for MJIT and stop skipping this once it does not randomly fail
         skip 'assert_no_memory_leak may consider MJIT memory usage as leak' if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
Index: test/ruby/test_parse.rb
===================================================================
--- test/ruby/test_parse.rb	(revision 65366)
+++ test/ruby/test_parse.rb	(revision 65367)
@@ -911,10 +911,8 @@ x = __ENCODING__ https://github.com/ruby/ruby/blob/trunk/test/ruby/test_parse.rb#L911
     assert_equal(expected, actual, bug5614)
   end
 
-  def test_shadowing_variable
-    assert_warning(/shadowing outer local variable/) {eval("a=1; tap {|a|}")}
-    a = "\u{3042}"
-    assert_warning(/#{a}/o) {eval("#{a}=1; tap {|#{a}|}")}
+  def test_no_shadowing_variable_warning
+    assert_no_warning(/shadowing outer local variable/) {eval("a=1; tap {|a|}")}
   end
 
   def test_unused_variable
Index: test/ruby/test_rubyoptions.rb
===================================================================
--- test/ruby/test_rubyoptions.rb	(revision 65366)
+++ test/ruby/test_rubyoptions.rb	(revision 65367)
@@ -782,20 +782,6 @@ class TestRubyOptions < Test::Unit::Test https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rubyoptions.rb#L782
     assert_in_out_err(["-w", "-"], "eval('a=1')", [], [], feature7730)
   end
 
-  def test_shadowing_variable
-    bug4130 = '[ruby-dev:42718]'
-    assert_in_out_err(["-we", "def foo\n""  a=1\n""  1.times do |a| end\n""  a\n""end"],
-                      "", [], ["-e:3: warning: shadowing outer local variable - a"], bug4130)
-    assert_in_out_err(["-we", "def foo\n""  a=1\n""  1.times do |a| end\n""end"],
-                      "", [],
-                      ["-e:3: warning: shadowing outer local variable - a",
-                       "-e:2: warning: assigned but unused variable - a",
-                      ], bug4130)
-    feature6693 = '[ruby-core:46160]'
-    assert_in_out_err(["-we", "def foo\n""  _a=1\n""  1.times do |_a| end\n""end"],
-                      "", [], [], feature6693)
-  end
-
   def test_script_from_stdin
     begin
       require 'pty'

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