gistfile1.txt

# the base
abstract class Stmt
    abstract def accept(visitor : Interpreter)
end

# the class with the constructor
class BlockStmt < Stmt
    property statements

    def initialize(statements : Array(Stmt | Nil))
        @statements = statements
    end

    def accept(visitor : Interpreter)
        visitor.visit_block_stmt(self)
    end
end

# the class in the array
class ExprStmt < Stmt
    property expression

    def initialize(expression : Expr)
        @expression = expression
    end

    def accept(visitor : Interpreter)
        visitor.visit_expr_stmt(self)
    end

end

# this creates the exception
block = BlockStmt.new([body, ExprStmt.new(increment)])