Uninstalling Rust on Travis requires something different

.travis.yml

@@ -14,6 +14,10 @@ matrix:
       rust: nightly
       env: TARGET=x86_64-unknown-linux-gnu
 
+    - os: linux
+      rust: stable
+      env: TARGET=x86_64-unknown-linux-gnu
+
   allow_failures:
     # TODO You might need to allow failures for some target on some channel for some reason. Below
     # there's one (commented out) example of how to do that. Just change the OS, channel and TARGET

ci/install.sh

@@ -17,9 +17,6 @@ install_c_toolchain() {
 }
 
 install_rustup() {
-    # uninstall the rust toolchain installed by travis, we are going to use rustup
-    sh ~/rust/lib/rustlib/uninstall.sh
-
     curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain=$TRAVIS_RUST_VERSION
 
     rustc -V