regression: f16 + f128 is unstable

[Mark-Simulacrum]

[INFO] [stdout] error[E0658]: the type `f16` is unstable
[INFO] [stdout]  --> src/float.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use f16::*;
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #116909 <https://github.com/rust-lang/rust/issues/116909> for more information

• https://crater-reports.s3.amazonaws.com/beta-1.78-3/beta-2024-03-30/gh/Cyborus04.more_nums/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.78-3/beta-2024-03-30/gh/jthomme1.gen_smooth/log.txt

[fmease]

cc @tgross35

[Noratrieb]

MCVE:

mod f16 { pub fn a() {} }

pub use f16::a;

[Noratrieb]

It compiles if I add #![feature(f16)]. Somehow feature gating and name resolution disagree whether it refers to the type or the module.

mod f32 { pub fn a() {} }

pub use f32::a;

also compiles

[Noratrieb]

I think this was fixed recently? It reproduces on the playground nightly, but does not reproduce on the latest nightly and on master.

[Noratrieb]

Ah no, I can reproduce it with cargo build, just not with rustc directly (?????????).

[Noratrieb]

cc @petrochenkov @compiler-errors, it was probably regressed by e782d27