Feature specific MSRV

.travis.yml

@@ -9,7 +9,6 @@ rust:
   - beta
   - nightly
 script:
-  - cargo build --verbose
   - ./ci/test_full.sh
 matrix:
   include:

README.md

@@ -47,4 +47,7 @@ Release notes are available in [RELEASES.md](RELEASES.md).
 
 ## Compatibility
 
-The `num-complex` crate is tested for rustc 1.15 and greater.
+The `num-complex` crate is tested for rustc 1.15 and greater, and each feature are tested for
+
+- `rand`: 1.22 and later
+- `i128`: 1.26 and later

ci/rustup.sh → ci/test_all_versions.sh

@@ -1,12 +1,11 @@
-#!/bin/sh
+#!/bin/bash
 # Use rustup to locally run the same suite of tests as .travis.yml.
-# (You should first install/update all versions listed below.)
+# This script installs toolchains used in CI process.
 
 set -ex
 
 export TRAVIS_RUST_VERSION
 for TRAVIS_RUST_VERSION in 1.15.0 1.22.0 1.26.0 stable beta nightly; do
-    run="rustup run $TRAVIS_RUST_VERSION"
-    $run cargo build --verbose
-    $run $PWD/ci/test_full.sh
+    rustup install $TRAVIS_RUST_VERSION
+    rustup run $TRAVIS_RUST_VERSION $(cd $(dirname $0);pwd)/test_full.sh
 done

ci/test_full.sh

@@ -4,11 +4,13 @@ set -ex
 
 echo Testing num-complex on rustc ${TRAVIS_RUST_VERSION}
 
+MINOR_VERSION=$(rustc --version | cut -f 1 | cut -d. -f 2)
+
 FEATURES="std serde"
-if [[ "$TRAVIS_RUST_VERSION" =~ ^(nightly|beta|stable|1.26.0|1.22.0)$ ]]; then
+if [[ $MINOR_VERSION -ge 22 ]]; then  # MSRV of rand feature is 1.22.0
   FEATURES="$FEATURES rand"
 fi
-if [[ "$TRAVIS_RUST_VERSION" =~ ^(nightly|beta|stable|1.26.0)$ ]]; then
+if [[ $MINOR_VERSION -ge 26 ]]; then  # MSRV of i128 features is 1.26.0
   FEATURES="$FEATURES i128"
 fi