Revert "Update MSRV to 1.70.0"

This reverts commit 7dfd691.

.github/bors.toml

@@ -1,5 +1,5 @@
 status = [
   "Check", "cargo deny", "pre-commit", "Rustfmt", "Clippy", "Test with minimal versions",
-  "Test suite (stable)", "Test suite (beta)", "Test suite (nightly)", "Test suite (1.70.0)"
+  "Test suite (stable)", "Test suite (beta)", "Test suite (nightly)", "Test suite (1.65.0)"
 ]
 delete_merged_branches = true

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
     needs: check
     strategy:
       matrix:
-        toolchain: [stable, beta, nightly, 1.70.0]
+        toolchain: [stable, beta, nightly, 1.65.0]
       fail-fast: false
     steps:
       - uses: actions/checkout@v3

Cargo.toml

@@ -11,7 +11,7 @@ authors = ["Samuel Tardieu <[email protected]>"]
 categories = ["algorithms"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.70.0"
+rust-version = "1.65.0"
 
 [package.metadata.release]
 sign-commit = true

README.md

@@ -89,7 +89,7 @@ floating-point types (such as `f32`) that implement `PartialOrd`
 in this context, you can wrap them into compliant types using the
 [ordered-float](https://crates.io/crates/ordered-float) crate.
 
-The minimum supported Rust version (MSRV) is Rust 1.70.0.
+The minimum supported Rust version (MSRV) is Rust 1.65.0.
 
 ## License
 

tests/ui.rs

@@ -1,7 +1,7 @@
 #[test]
 fn ui() {
     match std::env::var("TOOLCHAIN").as_deref() {
-        Ok("stable") | Ok("1.70.0") => (),
+        Ok("stable") | Ok("1.65.0") => (),
         _ => {
             let t = trybuild::TestCases::new();
             t.compile_fail("tests/ui/*.rs");