https://github.com/rust-lang/rust http://git.dreamy.place/mirrors/rust/atom?h=try 2025-06-23T13:45:56+00:00 2025-06-23T13:45:56+00:00 Alice Ryhl aliceryhl@google.com 2025-06-23T13:45:56+00:00 urn:sha1:6a1b7df4854b0023e34b18e2196d3069906da796 2025-06-19T07:47:49+00:00 Alice Ryhl aliceryhl@google.com 2025-06-12T10:56:43+00:00 urn:sha1:f3383e4942bca64ce523b7736a2bedd1b8426c11 2025-06-11T16:28:05+00:00 Mara Bos m-ou.se@m-ou.se 2025-06-11T16:28:05+00:00 urn:sha1:c85760c66ad94d0c1d50c5b8c537e26e896e6816 2025-06-04T16:23:05+00:00 Taylor Cramer cramertj@google.com 2025-01-03T01:47:10+00:00 urn:sha1:b541f93372c24bcbf036efc2b454cff6f6b8f8c5 This is useful for C/C++ APIs which expect the const char* returned from __FILE__ or std::source_location::file_name. 2025-03-06T21:21:59+00:00 Thalia Archibald thalia@archibald.dev 2025-03-06T02:14:07+00:00 urn:sha1:638b226a6ab5c5c784955068f57ae249e0ed0f92 These gates are unnecessary now that unit tests for `core` are in a separate package, `coretests`, instead of in the same files as the source code. They previously prevented the two `core` versions from conflicting with each other. 2024-11-27T12:10:21+00:00 Boxy rust@boxyuwu.dev 2024-11-25T11:46:46+00:00 urn:sha1:174ad448c7c5d71232bf50661f91b319b7e2a7e6 2024-11-03T06:49:24+00:00 Ralf Jung post@ralfj.de 2024-11-02T11:01:56+00:00 urn:sha1:234d3de8b441a9596e929e57d00d3c38560c5262 2024-10-25T18:31:40+00:00 Ralf Jung post@ralfj.de 2024-10-06T17:59:19+00:00 urn:sha1:a0215d8e46aab41219dea0bb1cbaaf97dafe2f89 Fundamentally, we have *three* disjoint categories of functions: 1. const-stable functions 2. private/unstable functions that are meant to be callable from const-stable functions 3. functions that can make use of unstable const features This PR implements the following system: - `#[rustc_const_stable]` puts functions in the first category. It may only be applied to `#[stable]` functions. - `#[rustc_const_unstable]` by default puts functions in the third category. The new attribute `#[rustc_const_stable_indirect]` can be added to such a function to move it into the second category. - `const fn` without a const stability marker are in the second category if they are still unstable. They automatically inherit the feature gate for regular calls, it can now also be used for const-calls. Also, several holes in recursive const stability checking are being closed. There's still one potential hole that is hard to avoid, which is when MIR building automatically inserts calls to a particular function in stable functions -- which happens in the panic machinery. Those need to *not* be `rustc_const_unstable` (or manually get a `rustc_const_stable_indirect`) to be sure they follow recursive const stability. But that's a fairly rare and special case so IMO it's fine. The net effect of this is that a `#[unstable]` or unmarked function can be constified simply by marking it as `const fn`, and it will then be const-callable from stable `const fn` and subject to recursive const stability requirements. If it is publicly reachable (which implies it cannot be unmarked), it will be const-unstable under the same feature gate. Only if the function ever becomes `#[stable]` does it need a `#[rustc_const_unstable]` or `#[rustc_const_stable]` marker to decide if this should also imply const-stability. Adding `#[rustc_const_unstable]` is only needed for (a) functions that need to use unstable const lang features (including intrinsics), or (b) `#[stable]` functions that are not yet intended to be const-stable. Adding `#[rustc_const_stable]` is only needed for functions that are actually meant to be directly callable from stable const code. `#[rustc_const_stable_indirect]` is used to mark intrinsics as const-callable and for `#[rustc_const_unstable]` functions that are actually called from other, exposed-on-stable `const fn`. No other attributes are required. 2024-09-29T11:01:41+00:00 Guillaume Gomez guillaume.gomez@huawei.com 2024-09-28T20:37:59+00:00 urn:sha1:6f5f21adfc88a914c507ba8c9a0f1f34ae292d44 2024-09-28T16:38:10+00:00 Guillaume Gomez guillaume.gomez@huawei.com 2024-09-27T16:03:54+00:00 urn:sha1:cdf2a8ffc5f8af31529b44964457a7a7e9979680