if len(x.ArgList) == 1 && !x.HasDots && (force || isTypeElem(x.ArgList[0])) {
				// x = name "(" x.ArgList[0] ")"
				return name, x.ArgList[0]
			}
		}
	}
	return nil, x
}

// isTypeElem reports whether x is a (possibly parenthesized) type element expression.
// The result is false if x could be a type element OR an ordinary (value) expression.
func isTypeElem(x Expr) bool {
	switch x := x.(type) {

				// x = name "(" x.ArgList[0] ")"
				return name, x.Args[0]
			}
		}
	}
	return nil, x
}

// isTypeElem reports whether x is a (possibly parenthesized) type element expression.
// The result is false if x could be a type element OR an ordinary (value) expression.
func isTypeElem(x ast.Expr) bool {
	switch x := x.(type) {

func isTypeElem(x ast.Expr) bool {
	switch x := x.(type) {
	case *ast.ArrayType, *ast.StructType, *ast.FuncType, *ast.InterfaceType, *ast.MapType, *ast.ChanType:
		return true
	case *ast.UnaryExpr:
		return x.Op == token.TILDE
	case *ast.BinaryExpr:
		return isTypeElem(x.X) || isTypeElem(x.Y)
	case *ast.ParenExpr:
		return isTypeElem(x.X)
	}
	return false
}

	switch x := x.(type) {
	case *Operation:
		if x.Y == nil {
			// name *x.X combines to name*x.X if x.X is not a type element
			return x.Op == Mul && !isTypeElem(x.X)
		}
		// binary expressions
		return combinesWithName(x.X) && !isTypeElem(x.Y)
	case *ParenExpr:
		// name(x) combines but we are making sure at
		// the call site that x is never parenthesized.
		panic("unexpected parenthesized expression")
	}