rustdoc broken hyperlinks for [src] of reexported macros (e.g. std::unimplemented!)

[rprichard]

On this page, https://doc.rust-lang.org/std/macro.unimplemented!.html, the [src] hyperlink points to https://doc.rust-lang.org/src/std/%3Ccore%20macros%3E.html#1, which does not exist.

The same problem happens on https://doc.rust-lang.org/std/macro.format!.html, which points to https://doc.rust-lang.org/src/std/%3Ccore_collections%20macros%3E.html#1-2. The filename here is <core_collections macros>.html, which matches the name that collections is aliased to in libstd below.

I think the problem happens with macros that are reexported from another crate.

This seems to be a complete list of reexported macros in Rust's standard library:

src/libstd/lib.rs:

#[macro_use]
#[macro_reexport(assert, assert_eq, debug_assert, debug_assert_eq,
    unreachable, unimplemented, write, writeln)]
extern crate core;

#[macro_use]
#[macro_reexport(vec, format)]
extern crate collections as core_collections;

[rprichard]

@steveklabnik Oh wait, this is obviously a duplicate of #23913, which you just opened.

I'll close it.