Regexp#match{?} with nil raises TypeError as String, Symbol (#1506)

* {String|Symbol}#match{?} with nil returns falsy

To improve consistency with Regexp#match{?}

* String#match(nil) returns `nil` instead of TypeError
* String#match?(nil) returns `false` instead of TypeError
* Symbol#match(nil) returns `nil` instead of TypeError
* Symbol#match?(nil) returns `false` instead of TypeError

* Prefer exception

* Follow empty ENV

* Drop outdated specs

* Write ruby/spec for above

https://github.com/ruby/ruby/pull/1506/files#r183242981

* Fix merge miss

spec/ruby/core/regexp/match_spec.rb

@@ -5,15 +5,15 @@ describe :regexp_match, shared: true do
   it "returns nil if there is no match" do
     /xyz/.send(@method,"abxyc").should be_nil
   end
-
-  it "returns nil if the object is nil" do
-    /\w+/.send(@method, nil).should be_nil
-  end
 end
 
 describe "Regexp#=~" do
   it_behaves_like :regexp_match, :=~
 
+  it "returns nil if the object is nil" do
+    (/\w+/ =~ nil).should be_nil
+  end
+
   it "returns the index of the first character of the matching region" do
     (/(.)(.)(.)/ =~ "abc").should == 0
   end
@@ -87,13 +87,21 @@ describe "Regexp#match" do
     end
   end
 
-  it "resets $~ if passed nil" do
-    # set $~
-    /./.match("a")
-    $~.should be_kind_of(MatchData)
+  ruby_version_is ""..."2.7" do
+    it "resets $~ if passed nil" do
+      # set $~
+      /./.match("a")
+      $~.should be_kind_of(MatchData)
+  
+      /1/.match(nil)
+      $~.should be_nil
+    end
+  end
 
-    /1/.match(nil)
-    $~.should be_nil
+  ruby_version_is "2.7" do
+    it "raises TypeError when the given argument is nil" do
+      -> { /foo/.match(nil) }.should raise_error(TypeError)
+    end
   end
 
   it "raises TypeError when the given argument cannot be coerced to String" do
@@ -129,8 +137,16 @@ describe "Regexp#match?" do
     /str/i.match?('string', 1).should be_false
   end
 
-  it "returns false when given nil" do
-    /./.match?(nil).should be_false
+  ruby_version_is ""..."2.7" do
+    it "returns false when given nil" do
+      /./.match?(nil).should be_false
+    end
+  end
+
+  ruby_version_is "2.7" do
+    it "raises TypeError when given nil" do
+      -> { /./.match?(nil) }.should raise_error(TypeError)
+    end
   end
 end