Do not autosplat when calling procs that accept rest and keywords

When providing a single array to a block that takes a splat, pass the
array as one argument of the splat instead of as the splat itself,
even if the block also accepts keyword arguments.  Previously, this
behavior was only used for blocks that did not accept keywords.

Implements [Feature#16166]

1 files changed, 20 insertions, 11 deletions

diff --git a/spec/ruby/language/block_spec.rb b/spec/ruby/language/block_spec.rb
index 1a8e79063d..99366006b0 100644
--- a/spec/ruby/language/block_spec.rb
+++ b/spec/ruby/language/block_spec.rb
@@ -76,18 +76,18 @@ describe "A block yielded a single" do
         result.should == [1, 2, [3], {x: 9}, 2, {}]
       end
 
-      it "does not treat final Hash as keyword arguments" do
+      it "does not treat final Hash as keyword arguments and does not autosplat" do
         result = m(["a" => 1, a: 10]) { |a=nil, **b| [a, b] }
-        result.should == [{"a" => 1, a: 10}, {}]
+        result.should == [[{"a" => 1, a: 10}], {}]
       end
 
-      it "does not call #to_hash on final argument to get keyword arguments" do
+      it "does not call #to_hash on final argument to get keyword arguments and does not autosplat" do
         suppress_keyword_warning do
           obj = mock("coerce block keyword arguments")
           obj.should_not_receive(:to_hash)
 
           result = m([obj]) { |a=nil, **b| [a, b] }
-          result.should == [obj, {}]
+          result.should == [[obj], {}]
         end
       end
     end
@@ -113,12 +113,12 @@ describe "A block yielded a single" do
     end
 
     ruby_version_is "2.8" do
-      it "does not call #to_hash on the argument when optional argument and keyword argument accepted" do
+      it "does not call #to_hash on the argument when optional argument and keyword argument accepted and does not autosplat" do
         obj = mock("coerce block keyword arguments")
         obj.should_not_receive(:to_hash)
 
         result = m([obj]) { |a=nil, **b| [a, b] }
-        result.should == [obj, {}]
+        result.should == [[obj], {}]
       end
     end
 
@@ -132,18 +132,27 @@ describe "A block yielded a single" do
         end
       end
       ruby_version_is "2.8" do
-        it "does not separates non-symbol keys and symbol keys" do
+        it "does not separate non-symbol keys and symbol keys and does not autosplat" do
           suppress_keyword_warning do
             result = m(["a" => 10, b: 2]) { |a=nil, **b| [a, b] }
-            result.should == [{"a" => 10, b: 2}, {}]
+            result.should == [[{"a" => 10, b: 2}], {}]
           end
         end
       end
     end
 
-    it "does not treat hashes with string keys as keyword arguments" do
-      result = m(["a" => 10]) { |a = nil, **b| [a, b] }
-      result.should == [{"a" => 10}, {}]
+    ruby_version_is ""..."2.8" do
+      it "does not treat hashes with string keys as keyword arguments" do
+        result = m(["a" => 10]) { |a = nil, **b| [a, b] }
+        result.should == [{"a" => 10}, {}]
+      end
+    end
+
+    ruby_version_is "2.8" do
+      it "does not treat hashes with string keys as keyword arguments and does not autosplat" do
+        result = m(["a" => 10]) { |a = nil, **b| [a, b] }
+        result.should == [[{"a" => 10}], {}]
+      end
     end
 
     ruby_version_is ''...'2.8' do