lldb报use of undeclared identifier

这个错误通常意味着您正在使用一个未声明的标识符，可能是变量、函数或对象。这可能是因为您的代码中缺少了必要的头文件或命名空间。

为了解决此问题，请查看您的代码并确保所有标识符都已正确声明并位于正确的作用域中。如果需要，可以添加适当的头文件或使用命名空间来解决名称冲突。如果问题仍然存在，请检查您的编译器和IDE设置是否正确配置。

相关问题

Playground execution failed: /var/folders/8b/b2dxlhsd1s74pjswbjrr_7t40000gn/T/./lldb/377/playground449.swift:5:19: error: use of undeclared type 'Error' enum EnrollError: Error { ^~~~~ /var/folders/8b/b2dxlhsd1s74pjswbjrr_7t40000gn/T/./lldb/377/playground449.swift:5:6: error: type 'EnrollError' does not conform to protocol 'RawRepresentable' enum EnrollError: Error { ^ Swift.RawRepresentable:9:13: note: protocol requires nested type 'RawValue' typealias RawValue ^ /var/folders/8b/b2dxlhsd1s74pjswbjrr_7t40000gn/T/./lldb/377/playground449.swift:16:31: error: thrown expression type 'EnrollError' does not conform to 'ErrorType' throw EnrollError.notAvailable ~~~~~~~~~~~~^~~~~~~~~~~~ /var/folders/8b/b2dxlhsd1s74pjswbjrr_7t40000gn/T/./lldb/377/playground449.swift:19:31: error: thrown expression type 'EnrollError' does not conform to 'ErrorType' throw EnrollError.notQualified ~~~~~~~~~~~~^~~~~~~~~~~~ /var/folders/8b/b2dxlhsd1s74pjswbjrr_7t40000gn/T/./lldb/377/playground449.swift:22:31: error: thrown expression type 'EnrollError' does not conform to 'ErrorType' throw EnrollError.alreadyEnrolled

抱歉，可能是由于Swift版本的问题导致代码无法运行。以下是更新后的代码，希望能够解决问题：

enum EnrollError: Error {
    case notAvailable
    case notQualified
    case alreadyEnrolled
}

class VendingCourse {
    var availableSlots = 3
    var isQualified = false
    var isEnrolled = false
    
    func enroll() throws {
        guard availableSlots > 0 else {
            throw EnrollError.notAvailable
        }
        
        guard isQualified else {
            throw EnrollError.notQualified
        }
        
        guard !isEnrolled else {
            throw EnrollError.alreadyEnrolled
        }
        
        availableSlots -= 1
        isEnrolled = true
        
        print("Enrollment successful!")
    }
}

let course = VendingCourse()
course.isQualified = true

do {
    try course.enroll()
} catch EnrollError.notAvailable {
    print("No available slots.")
} catch EnrollError.notQualified {
    print("Not qualified to enroll.")
} catch EnrollError.alreadyEnrolled {
    print("Already enrolled.")
} catch {
    print("An unknown error occurred.")
}

如果您还遇到问题，可以告诉我具体的错误信息，我会尽力帮助您解决问题。

vscode LLDB

LLDB是一种调试器，可用于在VSCode中进行编译调试。在Linux上使用VSCode与LLDB进行调试时，需要安装LLDB工具链和lldb-mi适配器。

安装步骤如下：
1. 安装Clang和LLDB工具链。可以使用选装命令在Ubuntu 22.04上安装：

   sudo ln -s /usr/lib/llvm-15/bin/clang /usr/bin/clang
   sudo ln -s /usr/lib/llvm-15/bin/clang++ /usr/bin/clang++
   sudo ln -s /usr/lib/llvm-15/bin/lldb /usr/bin/lldb
   sudo ln -s /usr/lib/llvm-15/bin/lldb-server-15.0.7 /usr/bin/

2. 安装lldb-mi适配器。lldb-mi是一个单独的项目，可以在https://github.com/lldb-tools/lldb-mi 上找到。