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-这是 `main.rs` 的默认内容，让我们先删除默认的 `Hello, World!`
-
-```rust
- 
- 
-fn main() {
-    println!("Hello, World!");
-}
-```
- 
----
-
-```rust
- 
- 
-fn main() {
-    println!("Hello, World!"); <<<<<<<<<< "删除 Hello, World!"
-}
-```
- 
----
-
-```rust
- 
- 
-fn main() {
-    <<<<<<<<<< "删除 Hello, World!"
-}
-```
- 
----
-
-接下来，让我们构建基本的 **Mingling** 程序入口
-
-```rust
- 
- 
-fn main() {
-    
-}
-```
- 
----
-
-```rust
-<<<<<<<<<< "在此处引入 Mingling 的预导入模块"
- 
-fn main() {
-    
-}
-```
- 
----
-```rust
-use mingling::prelude::*; <<<<<<<<<< "编写"
- 
-fn main() {
-    
-}
-```
- 
----
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    
-}
- 
-<<<<<<<<<< "在此处引入 gen_program!() 用于生成 ThisProgram"
-```
- 
----
-
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    
-}
- 
-gen_program!(); <<<<<<<<<< "编写"
-```
- 
----
-
-
-```rust
-use mingling::prelude::*; <<<<<<<<<< "gen_program!() 由 prelude 提供"
- 
-fn main() {
-    
-}
- 
-gen_program!();
-```
- 
----
-
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    
-}
- 
-gen_program!(); <<<<<<<<<< "gen_program!() 必须放在根模块的结尾，这是宏展开的限制"
-```
- 
----
-
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    <<<<<<<<<< "在此处使用 ThisProgram 创建程序"
-}
- 
-gen_program!(); 
-```
- 
----
-
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    let mut program = ThisProgram::new(); <<<<<<<<<< "编写"
-}
- 
-gen_program!(); 
-```
- 
----
-
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    let mut program = ThisProgram::new(); 
-}
- 
-gen_program!(); <<<<<<<<<< "ThisProgram 由 gen_program!() 生成"
-```
- 
----
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    let mut program = ThisProgram::new();
- 
-    <<<<<<<<<< "在此处执行程序并退出"
-}
- 
-gen_program!(); 
-```
- 
----
-
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    let mut program = ThisProgram::new();
- 
-    program.exec_and_exit(); <<<<<<<<<< "编写"
-}
- 
-gen_program!(); 
-```
- 
----
-
-至此， **Mingling**的基本入口就搭建完成
-
-```rust
-use mingling::prelude::*;
- 
-fn main() {
-    let mut program = ThisProgram::new();
- 
-    program.exec_and_exit();
-}
- 
-gen_program!(); 
-```