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A const-unstable function cannot call other const-unstable functions gated under a language feature gate #129656
Description
I expected this code to compile, but it does not:
#![feature(staged_api, f128)]
#![stable(feature = "rust_test", since = "1.0.0")]
#[unstable(feature = "f128", issue = "42")]
#[rustc_const_unstable(feature = "f128", issue = "42")]
const fn my_fun() {}
#[unstable(feature = "f128", issue = "42")]
#[rustc_const_unstable(feature = "f128", issue = "42")]
const fn my_fun2() {
my_fun()
}Renaming f128 to f128_const makes it compile, so somehow the issue must be related to the fact that f128 is a language feature gate. For regular library stability, we support also using a language feature as a library feature gate, but for const-stability that somehow does not work.
When this gets fixed, the f128_const and f16_const features (added in #129555) can be merged into the f128 and f16 features, respectively.
Cc @oli-obk
Activity
Rollup merge of rust-lang#129659 - RalfJung:const-fn-lang-feat, r=fee…
Unrolled build for rust-lang#129659
Rollup merge of #129659 - RalfJung:const-fn-lang-feat, r=fee1-dead
Rollup merge of rust-lang#131256 - RalfJung:f16-f128-const, r=ibrahee…
Rollup merge of rust-lang#131256 - RalfJung:f16-f128-const, r=ibrahee…
Unrolled build for rust-lang#131256
Rollup merge of #131256 - RalfJung:f16-f128-const, r=ibraheemdev