hex-literal: enforce const evaluation

Author: newpavlov

Cargo.lock

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.4.1 (2023-04-05)
+### Changed
+- Enforce const evaluation ([#886])
+
+[#886]: https://github.com/RustCrypto/utils/pull/886
+
 ## 0.4.0 (2023-04-02)
 ### Changed
 - Disallow comments inside hex strings ([#816])

hex-literal/CHANGELOG.md

@@ -1,6 +1,6 @@
 [package]
 name = "hex-literal"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["RustCrypto Developers"]
 license = "MIT OR Apache-2.0"
 description = "Macro for converting hexadecimal string to a byte array at compile time"

hex-literal/Cargo.toml

@@ -81,6 +81,8 @@ pub const fn decode<const LEN: usize>(strings: &[&[u8]]) -> [u8; LEN] {
 macro_rules! hex {
     ($($s:literal)*) => {{
         const STRINGS: &[&'static [u8]] = &[$($s.as_bytes(),)*];
-        $crate::decode::<{ $crate::len(STRINGS) }>(STRINGS)
+        const LEN: usize = $crate::len(STRINGS);
+        const RES: [u8; LEN] = $crate::decode(STRINGS);
+        RES
     }};
 }