parse.y: no named capture conflict warnings

* parse.y (reg_named_capture_assign_iter): remove named capture
  conflict warnings.  it is just annoying rather than useful.
  [ruby-core:75416] [Bug #12359]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55396 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Mon Jun 13 20:50:07 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (reg_named_capture_assign_iter): remove named capture
+	  conflict warnings.  it is just annoying rather than useful.
+	  [ruby-core:75416] [Bug #12359]
+
 Mon Jun 13 20:04:00 2016  Kenta Murata  <mrkn@mrkn.jp>
 
 	* numeric.c (rb_int_digits, rb_fix_digits, rb_int_digits_bigbase):

parse.y

@@ -10616,10 +10616,6 @@ reg_named_capture_assign_iter(const OnigUChar *name, const OnigUChar *name_end,
         return ST_CONTINUE;
     }
     var = intern_cstr(s, len, enc);
-    if (dvar_defined(var) || local_id(var)) {
-        rb_warning1("named capture conflicts a local variable - %"PRIsWARN,
-                    rb_id2str(var));
-    }
     node = newline_node(node_assign(assignable(var, 0), NEW_LIT(ID2SYM(var))));
     succ = arg->succ_block;
     if (!succ) succ = NEW_BEGIN(0);

test/ruby/test_parse.rb

@@ -869,9 +869,9 @@ x = __ENCODING__
 
   def test_named_capture_conflict
     a = 1
-    assert_warning(/named capture conflict/) {eval("a = 1; /(?<a>)/ =~ ''")}
+    assert_warning('') {eval("a = 1; /(?<a>)/ =~ ''")}
     a = "\u{3042}"
-    assert_warning(/#{a}/) {eval("#{a} = 1; /(?<#{a}>)/ =~ ''")}
+    assert_warning('') {eval("#{a} = 1; /(?<#{a}>)/ =~ ''")}
   end
 
 =begin