rustc-ap-rustc_error_codes 638.0.0

Automatically published version of the package `rustc_error_codes` in the rust-lang/rust repository from commit 30ca215b4e38b32aa7abdd635c5e2d56f5724494 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
Documentation 
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The `main` function was defined with generic parameters.

Erroneous code example:

```compile_fail,E0131
fn main<T>() { // error: main function is not allowed to have generic parameters
}
```

It is not possible to define the `main` function with generic parameters.
It must not take any arguments.