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Problem

From #12207 (comment)

I don't think a warning should be printed on a script without any frontmatter.

fn main() {
    println!("hello world");
}

Gives output:

warning: `package.edition` is unspecified, defaulting to `2024`
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.00s
     Running `/Users/nate/.cargo/build/cd/32beff75ef4495/target/debug/foo`
hello world

Proposed Solution

Do not emit warning when no edition is specified for a cargo script. Defaulting to the latest edition is a perfectly reasonable default, and is what anyone would expect. Warnings on bare rust scripts without frontmatter are unnecessary noise for users who may not care about edition stability. If you care about stability, you can still specify it easily with frontmatter.

Notes

N/A