6 files changed, 106 insertions, 12 deletions
diff --git a/spec/ruby/language/case_spec.rb b/spec/ruby/language/case_spec.rb
index 410cb9afb1..bf06803764 100644
--- a/spec/ruby/language/case_spec.rb
+++ b/spec/ruby/language/case_spec.rb
@@ -156,6 +156,15 @@ describe "The 'case'-construct" do
     end.should == "foo"
   end
 
+  it "tests an empty array" do
+    case []
+    when []
+      'foo'
+    else
+      'bar'
+    end.should == 'foo'
+  end
+
   it "expands arrays to lists of values" do
     case 'z'
     when *['a', 'b', 'c', 'd']
diff --git a/spec/ruby/language/class_spec.rb b/spec/ruby/language/class_spec.rb
index 83db164e1a..877895bf15 100644
--- a/spec/ruby/language/class_spec.rb
+++ b/spec/ruby/language/class_spec.rb
@@ -17,6 +17,19 @@ describe "The class keyword" do
     eval "class ClassSpecsKeywordWithoutSemicolon end"
     ClassSpecsKeywordWithoutSemicolon.should be_an_instance_of(Class)
   end
+
+  it "can redefine a class when called from a block" do
+    ClassSpecs::DEFINE_CLASS.call
+    A.should be_an_instance_of(Class)
+
+    Object.send(:remove_const, :A)
+    defined?(A).should be_nil
+
+    ClassSpecs::DEFINE_CLASS.call
+    A.should be_an_instance_of(Class)
+  ensure
+    Object.send(:remove_const, :A) if defined?(::A)
+  end
 end
 
 describe "A class definition" do
diff --git a/spec/ruby/language/constants_spec.rb b/spec/ruby/language/constants_spec.rb
index 03f1272401..bc76c60d20 100644
--- a/spec/ruby/language/constants_spec.rb
+++ b/spec/ruby/language/constants_spec.rb
@@ -718,3 +718,17 @@ describe 'Allowed characters' do
     eval("mod::ἍBB").should == 1
   end
 end
+
+describe 'Assignment' do
+  context 'dynamic assignment' do
+    it 'raises SyntaxError' do
+      -> do
+        eval <<-CODE
+          def test
+            B = 1
+          end
+        CODE
+      end.should raise_error(SyntaxError, /dynamic constant assignment/)
+    end
+  end
+end
diff --git a/spec/ruby/language/def_spec.rb b/spec/ruby/language/def_spec.rb
index 6b0be19d90..d72f8fa888 100644
--- a/spec/ruby/language/def_spec.rb
+++ b/spec/ruby/language/def_spec.rb
@@ -213,7 +213,7 @@ describe "An instance method with a default argument" do
   end
 
   ruby_version_is '2.7' do
-    it "raises a syntaxError an existing method with the same name as the local variable" do
+    it "raises a SyntaxError when there is an existing method with the same name as the local variable" do
       def bar
         1
       end
diff --git a/spec/ruby/language/pattern_matching_spec.rb b/spec/ruby/language/pattern_matching_spec.rb
index e4abae9412..5f5e2f4902 100644
--- a/spec/ruby/language/pattern_matching_spec.rb
+++ b/spec/ruby/language/pattern_matching_spec.rb
@@ -1297,6 +1297,65 @@ ruby_version_is "2.7" do
           a
         RUBY
       end
+
+      it "supports pinning instance variables" do
+        eval(<<~RUBY).should == true
+          @a = /a/
+          case 'abc'
+          in ^@a
+            true
+          end
+        RUBY
+      end
+
+      it "supports pinning class variables" do
+        result = nil
+        Module.new do
+          result = module_eval(<<~RUBY)
+            @@a = 0..10
+
+            case 2
+            in ^@@a
+              true
+            end
+          RUBY
+        end
+
+        result.should == true
+      end
+
+      it "supports pinning global variables" do
+        eval(<<~RUBY).should == true
+          $a = /a/
+          case 'abc'
+          in ^$a
+            true
+          end
+        RUBY
+      end
+
+      it "supports pinning expressions" do
+        eval(<<~RUBY).should == true
+          case 'abc'
+            in ^(/a/)
+            true
+          end
+        RUBY
+
+        eval(<<~RUBY).should == true
+          case {name: '2.6', released_at: Time.new(2018, 12, 25)}
+            in {released_at: ^(Time.new(2010)..Time.new(2020))}
+            true
+          end
+        RUBY
+
+        eval(<<~RUBY).should == true
+          case 0
+          in ^(0+0)
+            true
+          end
+        RUBY
+      end
     end
   end
 end
diff --git a/spec/ruby/language/variables_spec.rb b/spec/ruby/language/variables_spec.rb
index 699187335c..431c5aca99 100644
--- a/spec/ruby/language/variables_spec.rb
+++ b/spec/ruby/language/variables_spec.rb
@@ -797,17 +797,6 @@ describe 'Local variable shadowing' do
 end
 
 describe 'Allowed characters' do
-  # new feature in 2.6 -- https://bugs.ruby-lang.org/issues/13770
-  it 'does not allow non-ASCII upcased characters at the beginning' do
-    -> do
-      eval <<-CODE
-        def test
-          ἍBB = 1
-        end
-      CODE
-    end.should raise_error(SyntaxError, /dynamic constant assignment/)
-  end
-
   it 'allows non-ASCII lowercased characters at the beginning' do
     result = nil
 
@@ -821,6 +810,16 @@ describe 'Allowed characters' do
 
     result.should == 1
   end
+
+  it 'parses a non-ASCII upcased character as a constant identifier' do
+    -> do
+      eval <<-CODE
+        def test
+          ἍBB = 1
+        end
+      CODE
+    end.should raise_error(SyntaxError, /dynamic constant assignment/)
+  end
 end
 
 describe "Instance variables" do