Logo
Explore Help
Register Sign In
rust-lang/rust
1
0
Fork 0
You've already forked rust
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity
Files
42cc42b942088a94d95bc5169724d77429f20582
rust/tests/ui/const-generics/issues/issue-90455.fixed

14 lines
318 B
Rust
Raw Normal View History

Provide structured suggestion for unconstrained generic constant ``` error: unconstrained generic constant --> $DIR/const-argument-if-length.rs:18:10 | LL | pad: [u8; is_zst::<T>()], | ^^^^^^^^^^^^^^^^^^^ | help: try adding a `where` bound | LL | pub struct AtLeastByte<T: ?Sized> where [(); is_zst::<T>()]: { | ++++++++++++++++++++++++++ ``` Detect when the constant expression isn't `usize` and suggest casting: ``` error: unconstrained generic constant --> f300.rs:6:10 | 6 | bb::<{!N}>(); | ^^^^ -Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36 | help: try adding a `where` bound | 5 | fn b<const N: bool>() where [(); {!N} as usize]: { | ++++++++++++++++++++++++++ ``` Fix #122395.
2024-03-21 00:03:59 +00:00
//@ run-rustfix
#![feature(generic_const_exprs, adt_const_params)]
#![allow(incomplete_features, dead_code)]
struct FieldElement<const N: &'static str> where [(); num_limbs(N)]: {
n: [u64; num_limbs(N)],
//~^ ERROR unconstrained generic constant
}
const fn num_limbs(_: &str) -> usize {
0
}
fn main() {}
Reference in New Issue Copy Permalink
Powered by Gitea Version: 1.24.6 Page: 188ms Template: 3ms
English
Bahasa Indonesia Deutsch English Español Français Gaeilge Italiano Latviešu Magyar nyelv Nederlands Polski Português de Portugal Português do Brasil Suomi Svenska Türkçe Čeština Ελληνικά Български Русский Українська فارسی മലയാളം 日本語 简体中文 繁體中文(台灣) 繁體中文(香港) 한국어
Licenses API