Feature request: Generate type definition from struct or enum literal

[jplatte]

It would be really nice for quick prototyping if there was an assist that could generate a struct or enum definition given a corresponding literal with an undefined type name at the front.

Record struct:

let foo = Foo$0 { field: "hello".to_owned() };

// generate type definition
struct Foo {
    field: String,
}

Tuple struct:

let foo = Foo$0("world");

// generate type definition
struct Foo<'a>(&'a str);

Enum:

let bar = Foo$0::Bar;
let baz = Foo::Baz;

// generate type definition
enum Foo {
    Bar,
    Baz,
}

(and equivalent for enums with tuple or record fields)

[rustbot]

Error: Label A-assists can only be set by Rust team members

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[rustbot]

Error: Label C-feature can only be set by Rust team members

Please file an issue on GitHub at triagebot if there's a problem with this bot, or reach out on #t-infra on Zulip.