// Handle the entry functions only.
  if (func.getName() != "main" && (!attrs || attrs.empty())) {
    return;
  }

  OpBuilder builder(func);
  FunctionType func_type = func.getFunctionType();
  llvm::SmallVector<Type, 4> new_input_types(func_type.getInputs().begin(),
                                             func_type.getInputs().end());

    }

    @Test
    @TestMetadata("functionalType.kt")
    public void testFunctionalType() {
      runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expressionType/nameReference/functionalType.kt");
    }

    @Test
    @TestMetadata("functionalType_parens_1.kt")
    public void testFunctionalType_parens_1() {

    }

    @Test
    @TestMetadata("functionalType.kt")
    public void testFunctionalType() {
      runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expressionType/nameReference/functionalType.kt");
    }

    @Test
    @TestMetadata("functionalType_parens_1.kt")
    public void testFunctionalType_parens_1() {

    }
    std::vector<Type> return_types;
    for (auto ret_op : ret->getOperands()) {
      return_types.push_back(ret_op.getType());
    }
    auto newType =
        FunctionType::get(rewriter.getContext(), argument_types, return_types);
    if (f.getFunctionType() == newType) {
      return failure();
    }
    rewriter.modifyOpInPlace(f, [&] { f.setType(newType); });

      op.erase();
    }
  }
  if (lifted_op_and_arg_idx.empty()) return success();

  // Update the function signature as well as its uses.
  target_func.setType(FunctionType::get(target_func.getContext(),
                                        block.getArgumentTypes(),
                                        func_type.getResults()));

  IRMapping mapping;
  OpBuilder builder(module_op);

    }

    @Test
    @TestMetadata("functionalType.kt")
    public void testFunctionalType() {
      runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expressionType/nameReference/functionalType.kt");
    }

    @Test
    @TestMetadata("functionalType_parens_1.kt")
    public void testFunctionalType_parens_1() {

    }

    @Test
    @TestMetadata("functionalType.kt")
    public void testFunctionalType() {
      runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expressionType/nameReference/functionalType.kt");
    }

    @Test
    @TestMetadata("functionalType_parens_1.kt")
    public void testFunctionalType_parens_1() {

        } ?: return null

        val functionLiteral = blockExpression.parent as? KtFunctionLiteral
        return if (functionLiteral != null) {
            val functionalType = getExpectedType(functionLiteral) as? KaFunctionalType
            functionalType?.returnType
        } else {
            getExpectedType(blockExpression)
        }
    }

    elif node.id in TFR_BUILTINS:
      val = node.id
      lookup_type = anno.getanno(node, anno.Static.TYPES, types.FunctionType)
    else:
      op_def, _ = self._op_defs.lookup(node.id)
      val = op_def.name
      lookup_type = anno.getanno(node, anno.Static.TYPES, types.FunctionType)
    type_ = self._get_inferred_type(node, lookup_type)
    return val, type_

  def visit_Return(self, node):

      llvm::StringMap<Attribute>* derived_attrs) const;

  // Uses the collected attribute values to derive all the output types.
  LogicalResult DeriveOutputTypes(Location loc, FunctionType signature,
                                  const llvm::StringMap<Attribute>& attrs,
                                  SmallVectorImpl<Type>* output_types) const;