newarraykwsplat

Author: kddnewton

lib/syntax_tree/compiler.rb

@@ -311,6 +311,15 @@ def visit_args(node)
     def visit_array(node)
       if (compiled = RubyVisitor.compile(node))
         iseq.duparray(compiled)
+      elsif node.contents && node.contents.parts.length == 1 &&
+            node.contents.parts.first.is_a?(BareAssocHash) &&
+            node.contents.parts.first.assocs.length == 1 &&
+            node.contents.parts.first.assocs.first.is_a?(AssocSplat)
+        iseq.putspecialobject(YARV::VM_SPECIAL_OBJECT_VMCORE)
+        iseq.newhash(0)
+        visit(node.contents.parts.first)
+        iseq.send(:"core#hash_merge_kwd", 2)
+        iseq.newarraykwsplat(1)
       else
         length = 0
 

lib/syntax_tree/yarv.rb

@@ -502,6 +502,11 @@ def newarray(length)
         push([:newarray, length])
       end
 
+      def newarraykwsplat(length)
+        stack.change_by(-length + 1)
+        push([:newarraykwsplat, length])
+      end
+
       def newhash(length)
         stack.change_by(-length + 1)
         push([:newhash, length])

test/compiler_test.rb

@@ -311,6 +311,7 @@ class CompilerTest < Minitest::Test
       "[1, 2, 3].min",
       "[foo, bar, baz].min",
       "[foo, bar, baz].min(1)",
+      "[**{ x: true }][0][:x]",
       # Core method calls
       "alias foo bar",
       "alias :foo :bar",