Auto merge of #457 - cuviper:msrv-1.63, r=Amanieu

Relax MSRV to 1.63.0

No code changes are required, and this allows the current compiler
shipped by Debian stable (bookworm) to work. The only consideration is
that recent versions of `allocator-api2` do require 1.64, but the
minimum dependency 0.2.9 is fine, and this is optional anyway.

Author: bors

.github/workflows/rust.yml

@@ -50,7 +50,7 @@ jobs:
           thumbv6m-none-eabi,
           x86_64-pc-windows-gnu,
         ]
-        channel: [1.64.0, nightly]
+        channel: [1.63.0, nightly]
         include:
         - os: macos-latest
           target: x86_64-apple-darwin
@@ -60,13 +60,13 @@ jobs:
           channel: nightly
         - os: macos-latest
           target: x86_64-apple-darwin
-          channel: 1.64.0
+          channel: 1.63.0
         - os: windows-latest
           target: x86_64-pc-windows-msvc
-          channel: 1.64.0
+          channel: 1.63.0
         - os: ubuntu-latest
           target: x86_64-unknown-linux-gnu
-          channel: 1.64.0
+          channel: 1.63.0
         - os: ubuntu-latest
           target: x86_64-unknown-linux-gnu
           channel: beta

Cargo.toml

@@ -10,7 +10,7 @@ keywords = ["hash", "no_std", "hashmap", "swisstable"]
 categories = ["data-structures", "no-std"]
 exclude = [".github", "/ci/*"]
 edition = "2021"
-rust-version = "1.64.0"
+rust-version = "1.63.0"
 
 [dependencies]
 # For the default hasher

README.md

@@ -4,7 +4,7 @@ hashbrown
 [![Build Status](https://github.com/rust-lang/hashbrown/actions/workflows/rust.yml/badge.svg)](https://github.com/rust-lang/hashbrown/actions)
 [![Crates.io](https://img.shields.io/crates/v/hashbrown.svg)](https://crates.io/crates/hashbrown)
 [![Documentation](https://docs.rs/hashbrown/badge.svg)](https://docs.rs/hashbrown)
-[![Rust](https://img.shields.io/badge/rust-1.64.0%2B-blue.svg?maxAge=3600)](https://github.com/rust-lang/hashbrown)
+[![Rust](https://img.shields.io/badge/rust-1.63.0%2B-blue.svg?maxAge=3600)](https://github.com/rust-lang/hashbrown)
 
 This crate is a Rust port of Google's high-performance [SwissTable] hash
 map, adapted to make it a drop-in replacement for Rust's standard `HashMap`

ci/run.sh

@@ -16,6 +16,9 @@ if [ "${CHANNEL}" = "nightly" ]; then
     FEATURES="${FEATURES},nightly"
     export RUSTFLAGS="$RUSTFLAGS -D warnings"
 fi
+if [ "${CHANNEL}" = "1.63.0" ]; then
+    cargo update --package allocator-api2 --precise 0.2.9
+fi
 
 CARGO=cargo
 if [ "${CROSS}" = "1" ]; then