rustdoc: Only the last enum variant / struct member is collapsable.

[kennytm]

Test case:

pub enum A {
    /// Long long long
    X,
    /// Long long long
    Y,
    /// Long long long
    Z,
}

pub struct B {
    /// Long long long
    pub x: u32,
    /// Long long long
    pub y: u32,
    /// Long long long
    pub z: u32,
}

Running rustdoc a.rs, it produces these webpages:

Note that only the last member is collapsible (has a [-]). The global collapse control on the top-right corner can still collapse everything (as a result, you can't independently open X and Y after they are collapsed since the control [+] is missing).

This seems to happen only for 1.19.0+. Same result on Firefox and Chrome.

Real world example:

• https://doc.rust-lang.org/1.18.0/std/io/enum.ErrorKind.html: every variant is collapsible.
• https://doc.rust-lang.org/beta/std/io/enum.ErrorKind.html: only the last variant is collapsible.

---

$ rustdoc -vV
rustdoc 1.19.0-nightly (03abb1bd7 2017-06-13)
binary: rustdoc
commit-hash: 03abb1bd70ac56e4aba0684bab819892a0157843
commit-date: 2017-06-13
host: x86_64-apple-darwin
release: 1.19.0-nightly
LLVM version: 4.0