1 files changed, 63 insertions, 3 deletions
diff --git a/spec/ruby/language/assignments_spec.rb b/spec/ruby/language/assignments_spec.rb
index 4ad9f4167b..d621c9f0c6 100644
--- a/spec/ruby/language/assignments_spec.rb
+++ b/spec/ruby/language/assignments_spec.rb
@@ -36,7 +36,7 @@ describe 'Assignments' do
 
         -> {
           (:not_a_module)::A = (ScratchPad << :rhs; :value)
-        }.should raise_error(TypeError)
+        }.should.raise(TypeError)
 
         ScratchPad.recorded.should == [:rhs]
       end
@@ -68,7 +68,35 @@ describe 'Assignments' do
 
           -> {
             eval "obj[:a, &block] = 2"
-          }.should raise_error(SyntaxError, /unexpected block arg given in index assignment|block arg given in index assignment/)
+          }.should.raise(SyntaxError, /unexpected block arg given in index assignment|block arg given in index assignment/)
+        end
+      end
+    end
+
+    context "given keyword arguments" do
+      before do
+        @klass = Class.new do
+          attr_reader :x
+
+          def []=(*args, **kw)
+            @x = [args, kw]
+          end
+        end
+      end
+
+      ruby_version_is ""..."3.4" do
+        it "supports keyword arguments in index assignments" do
+          a = @klass.new
+          eval "a[1, 2, 3, b: 4] = 5"
+          a.x.should == [[1, 2, 3, {b: 4}, 5], {}]
+        end
+      end
+
+      ruby_version_is "3.4" do
+        it "raises SyntaxError when given keyword arguments in index assignments" do
+          a = @klass.new
+          -> { eval "a[1, 2, 3, b: 4] = 5" }.should.raise(SyntaxError,
+            /keywords are not allowed in index assignment expressions|keyword arg given in index assignment/) # prism|parse.y
         end
       end
     end
@@ -171,7 +199,39 @@ describe 'Assignments' do
 
             -> {
               eval "obj[:a, &block] += 2"
-            }.should raise_error(SyntaxError, /unexpected block arg given in index assignment|block arg given in index assignment/)
+            }.should.raise(SyntaxError, /unexpected block arg given in index assignment|block arg given in index assignment/)
+          end
+        end
+      end
+
+      context "given keyword arguments" do
+        before do
+          @klass = Class.new do
+            attr_reader :x
+
+            def [](*args)
+              100
+            end
+
+            def []=(*args, **kw)
+              @x = [args, kw]
+            end
+          end
+        end
+
+        ruby_version_is ""..."3.4" do
+          it "supports keyword arguments in index assignments" do
+            a = @klass.new
+            eval "a[1, 2, 3, b: 4] += 5"
+            a.x.should == [[1, 2, 3, 105], {b: 4}]
+          end
+        end
+
+        ruby_version_is "3.4" do
+          it "raises SyntaxError when given keyword arguments in index assignments" do
+            a = @klass.new
+            -> { eval "a[1, 2, 3, b: 4] += 5" }.should.raise(SyntaxError,
+              /keywords are not allowed in index assignment expressions|keyword arg given in index assignment/) # prism|parse.y
           end
         end
       end