Upgrade to 2018 edition and MSRV 1.31

.travis.yml

@@ -1,10 +1,9 @@
 language: rust
 sudo: false
 rust:
-  - 1.15.0
-  - 1.22.0 # rand
-  - 1.26.0 # has_i128
   - 1.31.0 # 2018!
+  - 1.32.0 # rand
+  - 1.36.0 # alloc
   - stable
   - beta
   - nightly
@@ -13,10 +12,18 @@ script:
   - ./ci/test_full.sh
 matrix:
   include:
-    # try a target that doesn't have std at all
-    - name: "no_std"
+    # try a target that doesn't have std at all, but does have alloc
+    - name: "alloc"
       rust: stable
       env: TARGET=thumbv6m-none-eabi
+      before_script:
+        - rustup target add $TARGET
+      script:
+        - cargo build --verbose --target $TARGET --no-default-features --features "alloc serde rand"
+    # try a target that doesn't have std at all, nor alloc
+    - name: "no_std"
+      rust: 1.31.0
+      env: TARGET=thumbv6m-none-eabi
       before_script:
         - rustup target add $TARGET
       script:

Cargo.toml

@@ -12,6 +12,7 @@ version = "0.3.0-pre"
 readme = "README.md"
 exclude = ["/ci/*", "/.travis.yml", "/bors.toml"]
 publish = false
+edition = "2018"
 
 [package.metadata.docs.rs]
 features = ["std", "serde", "rand"]
@@ -22,7 +23,7 @@ travis-ci = { repository = "rust-num/num" }
 [dependencies]
 
 [dependencies.num-bigint]
-optional = true # needs std
+optional = true # needs std until Rust 1.36
 version = "0.3.0-pre"
 git = "https://github.com/rust-num/num-bigint"
 default-features = false
@@ -35,10 +36,12 @@ default-features = false
 [dependencies.num-integer]
 version = "0.1.42"
 default-features = false
+features = ["i128"]
 
 [dependencies.num-iter]
 version = "0.1.40"
 default-features = false
+features = ["i128"]
 
 [dependencies.num-rational]
 version = "0.3.0-pre"
@@ -48,6 +51,7 @@ default-features = false
 [dependencies.num-traits]
 version = "0.2.11"
 default-features = false
+features = ["i128"]
 
 [dev-dependencies]
 
@@ -59,18 +63,11 @@ std = [
   "num-complex/std",
   "num-integer/std",
   "num-iter/std",
-  "num-rational/std", "num-rational/bigint",
+  "num-rational/std", "num-rational/bigint-std",
   "num-traits/std",
 ]
 
-i128 = [
-  "num-bigint/i128",
-  "num-complex/i128",
-  "num-integer/i128",
-  "num-iter/i128",
-  "num-rational/i128",
-  "num-traits/i128",
-]
+alloc = ["num-bigint", "num-rational/bigint"]
 
 rand = [
   "num-bigint/rand",

README.md

@@ -2,7 +2,7 @@
 
 [![crate](https://img.shields.io/crates/v/num.svg)](https://crates.io/crates/num)
 [![documentation](https://docs.rs/num/badge.svg)](https://docs.rs/num)
-![minimum rustc 1.15](https://img.shields.io/badge/rustc-1.15+-red.svg)
+![minimum rustc 1.31](https://img.shields.io/badge/rustc-1.31+-red.svg)
 [![Travis status](https://travis-ci.org/rust-num/num.svg?branch=master)](https://travis-ci.org/rust-num/num)
 
 A collection of numeric types and traits for Rust.
@@ -32,13 +32,7 @@ Add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-num = "0.2"
-```
-
-and this to your crate root:
-
-```rust
-extern crate num;
+num = "0.3"
 ```
 
 ## Features
@@ -48,16 +42,13 @@ the default `std` feature. Use this in `Cargo.toml`:
 
 ```toml
 [dependencies.num]
-version = "0.2"
+version = "0.3"
 default-features = false
 ```
 
-The `num-bigint` crate is only available when `std` is enabled, and the other
-sub-crates may have limited functionality when used without `std`.
-
-Implementations for `i128` and `u128` are only available with Rust 1.26 and
-later.  The build script automatically detects this, but you can make it
-mandatory by enabling the `i128` crate feature.
+The `num-bigint` crate requires the `std` feature, or the `alloc` feature may
+be used instead with Rust 1.36 and later. Other sub-crates may also have
+limited functionality when used without `std`.
 
 The `rand` feature enables randomization traits in `num-bigint` and
 `num-complex`.
@@ -75,7 +66,7 @@ Release notes are available in [RELEASES.md](RELEASES.md).
 
 ## Compatibility
 
-The `num` crate as a whole is tested for rustc 1.15 and greater.
+The `num` crate as a whole is tested for rustc 1.31 and greater.
 
 The `num-traits`, `num-integer`, and `num-iter` crates are individually tested
 for rustc 1.8 and greater, if you require such older compatibility.

ci/rustup.sh

@@ -5,7 +5,7 @@
 set -ex
 
 export TRAVIS_RUST_VERSION
-for TRAVIS_RUST_VERSION in 1.15.0 1.22.0 1.26.0 stable beta nightly; do
+for TRAVIS_RUST_VERSION in 1.31.0 1.32.0 1.36.0 stable beta nightly; do
     run="rustup run $TRAVIS_RUST_VERSION"
     $run cargo build --verbose
     $run $PWD/ci/test_full.sh

ci/test_full.sh

@@ -4,13 +4,15 @@ set -ex
 
 echo Testing num on rustc ${TRAVIS_RUST_VERSION}
 
-FEATURES="serde"
-if [[ "$TRAVIS_RUST_VERSION" =~ ^(nightly|beta|stable|1.26.0|1.22.0)$ ]]; then
-  FEATURES="$FEATURES rand"
-fi
-if [[ "$TRAVIS_RUST_VERSION" =~ ^(nightly|beta|stable|1.26.0)$ ]]; then
-  FEATURES="$FEATURES i128"
-fi
+case "$TRAVIS_RUST_VERSION" in
+  1.31.*) STD_FEATURES="serde" ;;
+  *) STD_FEATURES="serde rand" ;;
+esac
+
+case "$TRAVIS_RUST_VERSION" in
+  1.3[1-5].*) ;;
+  *) ALLOC_FEATURES="serde rand" ;;
+esac
 
 # num should build and test everywhere.
 cargo build --verbose
@@ -22,11 +24,27 @@ cargo test --no-default-features
 
 # Each isolated feature should also work everywhere.
 # (but still with "std", else bigint breaks)
-for feature in $FEATURES; do
+for feature in $STD_FEATURES; do
   cargo build --verbose --no-default-features --features="std $feature"
   cargo test --verbose --no-default-features --features="std $feature"
 done
 
 # test all supported features together
-cargo build --features="std $FEATURES"
-cargo test --features="std $FEATURES"
+cargo build --features="std $STD_FEATURES"
+cargo test --features="std $STD_FEATURES"
+
+if test -n "${ALLOC_FEATURES:+true}"; then
+  # It should build with minimal features too.
+  cargo build --no-default-features --features="alloc"
+  cargo test --no-default-features --features="alloc"
+
+  # Each isolated feature should also work everywhere.
+  for feature in $ALLOC_FEATURES; do
+    cargo build --verbose --no-default-features --features="alloc $feature"
+    cargo test --verbose --no-default-features --features="alloc $feature"
+  done
+
+  # test all supported features together
+  cargo build --no-default-features --features="alloc $ALLOC_FEATURES"
+  cargo test --no-default-features --features="alloc $ALLOC_FEATURES"
+fi

src/lib.rs

@@ -20,8 +20,7 @@
 //! approximate a square root to arbitrary precision:
 //!
 //! ```
-//! extern crate num;
-//! # #[cfg(feature = "std")]
+//! # #[cfg(any(feature = "alloc", feature = "std"))]
 //! # mod test {
 //!
 //! use num::FromPrimitive;
@@ -41,9 +40,9 @@
 //!     approx
 //! }
 //! # }
-//! # #[cfg(not(feature = "std"))]
+//! # #[cfg(not(any(feature = "alloc", feature = "std")))]
 //! # mod test { pub fn approx_sqrt(n: u64, _: usize) -> u64 { n } }
-//! # use test::approx_sqrt;
+//! # use crate::test::approx_sqrt;
 //!
 //! fn main() {
 //!     println!("{}", approx_sqrt(10, 4)); // prints 4057691201/1283082416
@@ -55,25 +54,17 @@
 //!
 //! ## Compatibility
 //!
-//! The `num` crate is tested for rustc 1.15 and greater.
+//! The `num` crate is tested for rustc 1.31 and greater.
 
-#![doc(html_root_url = "https://docs.rs/num/0.2")]
+#![doc(html_root_url = "https://docs.rs/num/0.3")]
 #![no_std]
 
-#[cfg(feature = "std")]
-extern crate num_bigint;
-extern crate num_complex;
-extern crate num_integer;
-extern crate num_iter;
-extern crate num_rational;
-extern crate num_traits;
-
-#[cfg(feature = "std")]
+#[cfg(any(feature = "alloc", feature = "std"))]
 pub use num_bigint::{BigInt, BigUint};
 
 pub use num_complex::Complex;
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "alloc", feature = "std"))]
 pub use num_rational::BigRational;
 pub use num_rational::Rational;
 
@@ -89,7 +80,7 @@ pub use num_traits::{
     Signed, ToPrimitive, Unsigned, Zero,
 };
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "alloc", feature = "std"))]
 pub mod bigint {
     pub use num_bigint::*;
 }