cargo publish error message unhelpful with publish = false

[wooorm]

Problem

$ cargo publish --dry-run
error: `xxxxxxxx` cannot be published.
The registry `crates-io` is not listed in the `publish` value in Cargo.toml.

It’s a bit stupid on my part, I forgot for a second that I had publish = false in my Cargo.toml to prevent publishing, but this error message threw me off.
I can imagine that some other folks would run into this too, so I’m raising this here.

Proposed Solution

How about an error message, if publish = false, along the lines of:

error: `xxxxxxxx` cannot be published.
`publish` is set to `false` in Cargo.toml and prevents publishing.

Notes

No response

[Rustin170506]

The registry `crates-io` is not listed in the `publish` value in Cargo.toml.

I think this message makes sense but maybe needs some improvement.
Cargo said that because we can add a registry list in the publish field. You can check out this reference.
So I think the error message makes sense to say that. And I think it also makes sense to add a clear error message if we just set the publish field be false.

I am happy to help improve it if it is acceptable.