Diesel的schema.rs没生成

我根据文档一步步操作 https://diesel.rs/guides/getting-started/

Typically the schema module isn't created by hand, it gets generated by Diesel. When we ran diesel setup, a file called diesel.toml was created which tells Diesel to maintain a file at src/schema.rs for us. The file should look like this

diesel.toml 文件是有了，但是我没搞懂 src/schema.rs 是怎么生成的

再运行，那么就报错了

error[E0583]: file not found for module `schema`
 --> src/lib.rs:1:9
  |
1 | pub mod schema;
  |         ^^^^^^
  |
  = help: name the file either schema.rs or schema/mod.rs inside the directory "src"

error: aborting due to previous error

For more information about this error, try `rustc --explain E0583`.
error: Could not compile `diesel_demo`.

是我哪里遗漏了什么吗...

环境： cargo 1.36.0-nightly (6be12653d 2019-04-19)