Rb yield splat fix

PullRequest: truffleruby/744

Author: aardvark179

lib/truffle/truffle/cext.rb

@@ -1091,7 +1091,7 @@ def rb_yield(value)
   end
 
   def rb_yield_splat(values)
-    Truffle.invoke_primitive(:interop_call_c_with_mutex, rb_block_proc, [values])
+    Truffle.invoke_primitive(:interop_call_c_with_mutex, rb_block_proc, values)
   end
 
   def rb_ivar_lookup(object, name, default_value)

spec/ruby/optional/capi/kernel_spec.rb

@@ -244,6 +244,10 @@
       @s.rb_yield_splat([1, 2]) { |x, y| x + y }.should == 3
     end
 
+    it "passes arguments to a block accepting splatted args" do
+      @s.rb_yield_splat([1, 2]) { |*v| v }.should == [1, 2]
+    end
+
     it "raises LocalJumpError when no block is given" do
       lambda { @s.rb_yield_splat([1, 2]) }.should raise_error(LocalJumpError)
     end