julia:显示控制流中的`catch`错误

function divide(a, b)
    try
        result = a / b
    catch e
        if isa(e, DivideError)
            println("Error: Division by zero is not allowed.")
            return nothing
        else
            println("An unexpected error occurred: $(e)")
            return nothing
        end
    end
    return result
end

# 测试函数
println(divide(10, 2))  # 输出: 5.0
println(divide(10, 0))  # 输出: Error: Division by zero is not allowed.

function nested_try_catch()
    try
        println("Outer try block")
        try
            println("Inner try block")
            throw(DivideError())
        catch e
            println("Inner catch block: $(e)")
        end
    catch e
        println("Outer catch block: $(e)")
    finally
        println("Finally block")
    end
end

nested_try_catch()
# 输出:
# Outer try block
# Inner try block
# Inner catch block: DivideError()
# Finally block