nightly-rustc docs don't include rustdoc in the index

[jyn514]

https://doc.rust-lang.org/nightly/nightly-rustc/ doesn't have a link to https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/.

Meta

HEAD is currently at 353f3a3.

This is generated with --enable-index-page:

rust/src/bootstrap/doc.rs

Line 528 in 353f3a3

cargo.rustdocflag("--enable-index-page");

So this is either a bug in rustdoc or bootstrap. Maybe rustdoc needs to be added to

rust/src/bootstrap/doc.rs

Line 541 in 353f3a3

for root_crate in &["rustc_driver", "rustc_codegen_llvm", "rustc_codegen_ssa"] {

?

[ehuss]

Sorry, I neglected to include the flag for both invocations. Posted #80316 with a fix.