Use namespaced-features to safely bump to MSRV 1.60

Earlier versions won't see the incompatible updates at all!

Author: cuviper

.github/workflows/ci.yaml

@@ -9,8 +9,7 @@ jobs:
     strategy:
       matrix:
         rust: [
-          1.31.0, # 2018!
-          1.36.0, # alloc
+          1.60.0, # MSRV
           stable,
           beta,
           nightly
@@ -29,7 +28,7 @@ jobs:
       - run: ./ci/test_full.sh
 
   # try a target that doesn't have std at all, but does have alloc
-  no_std_stable:
+  no_std:
     name: No Std (stable)
     runs-on: ubuntu-latest
     steps:
@@ -39,21 +38,6 @@ jobs:
           target: thumbv6m-none-eabi
       - run: cargo build --target thumbv6m-none-eabi --no-default-features --features "num-bigint serde"
 
-  # try a target that doesn't have std at all, nor alloc
-  no_std_131:
-    name: No Std (1.31.0)
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/cache@v4
-        with:
-          path: ~/.cargo/registry/index
-          key: cargo-1.31.0-git-index
-      - uses: dtolnay/[email protected]
-        with:
-          target: thumbv6m-none-eabi
-      - run: cargo build --target thumbv6m-none-eabi --no-default-features --features "serde"
-
   fmt:
     name: Format
     runs-on: ubuntu-latest
@@ -69,7 +53,7 @@ jobs:
   success:
     name: Success
     runs-on: ubuntu-latest
-    needs: [test, no_std_131, no_std_stable, fmt]
+    needs: [test, no_std, fmt]
     # Github branch protection is exceedingly silly and treats "jobs skipped because a dependency
     # failed" as success. So we have to do some contortions to ensure the job fails if any of its
     # dependencies fails.

.github/workflows/master.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.31.0, stable]
+        rust: [1.60.0, stable]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/cache@v4

.github/workflows/pr.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.31.0, stable]
+        rust: [1.60.0, stable]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/cache@v4

Cargo.toml

@@ -12,6 +12,7 @@ version = "0.4.1"
 readme = "README.md"
 exclude = ["/ci/*", "/.github/*"]
 edition = "2018"
+rust-version = "1.60"
 
 [package.metadata.docs.rs]
 features = ["std", "num-bigint-std", "serde"]
@@ -39,9 +40,11 @@ version = "1.0.0"
 default-features = false
 
 [features]
-default = ["num-bigint-std", "std"]
-std = ["num-integer/std", "num-traits/std"]
+default = ["num-bigint", "std"]
+std = ["num-bigint?/std", "num-integer/std", "num-traits/std"]
 num-bigint-std = ["num-bigint/std"]
+num-bigint = ["dep:num-bigint"]
+serde = ["dep:serde"]
 
 [build-dependencies]
 autocfg = "1.0.0"

README.md

@@ -2,7 +2,7 @@
 
 [![crate](https://img.shields.io/crates/v/num-rational.svg)](https://crates.io/crates/num-rational)
 [![documentation](https://docs.rs/num-rational/badge.svg)](https://docs.rs/num-rational)
-[![minimum rustc 1.31](https://img.shields.io/badge/rustc-1.31+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
+[![minimum rustc 1.60](https://img.shields.io/badge/rustc-1.60+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
 [![build status](https://github.com/rust-num/num-rational/workflows/master/badge.svg)](https://github.com/rust-num/num-rational/actions)
 
 Generic `Rational` numbers (aka fractions) for Rust.
@@ -33,7 +33,7 @@ Release notes are available in [RELEASES.md](RELEASES.md).
 
 ## Compatibility
 
-The `num-rational` crate is tested for rustc 1.31 and greater.
+The `num-rational` crate is tested for rustc 1.60 and greater.
 
 ## License
 

ci/rustup.sh

@@ -5,6 +5,6 @@
 set -ex
 
 ci=$(dirname $0)
-for version in 1.31.0 1.36.0 stable beta nightly; do
+for version in 1.60.0 stable beta nightly; do
     rustup run "$version" "$ci/test_full.sh"
 done

ci/test_full.sh

@@ -3,7 +3,7 @@
 set -e
 
 CRATE=num-rational
-MSRV=1.31
+MSRV=1.60
 
 get_rust_version() {
   local array=($(rustc --version));
@@ -28,8 +28,7 @@ if ! check_version $MSRV ; then
 fi
 
 STD_FEATURES=(num-bigint-std serde)
-NO_STD_FEATURES=(serde)
-check_version 1.36 && NO_STD_FEATURES+=(num-bigint)
+NO_STD_FEATURES=(num-bigint serde)
 echo "Testing supported features: ${STD_FEATURES[*]}"
 echo " no_std supported features: ${NO_STD_FEATURES[*]}"
 

src/lib.rs

@@ -12,7 +12,7 @@
 //!
 //! ## Compatibility
 //!
-//! The `num-rational` crate is tested for rustc 1.31 and greater.
+//! The `num-rational` crate is tested for rustc 1.60 and greater.
 
 #![doc(html_root_url = "https://docs.rs/num-rational/0.4")]
 #![no_std]
@@ -73,7 +73,7 @@ pub type Rational64 = Ratio<i64>;
 /// Alias for arbitrary precision rationals.
 pub type BigRational = Ratio<BigInt>;
 
-/// These method are `const` for Rust 1.31 and later.
+/// These method are `const`.
 impl<T> Ratio<T> {
     /// Creates a `Ratio` without checking for `denom == 0` or reducing.
     ///