ci: add nightly build job to rnu the no-panic test

library/compiler-builtins/libm/.travis.yml

@@ -17,6 +17,9 @@ matrix:
     - env: TARGET=x86_64-unknown-linux-gnu
     - env: TARGET=cargo-fmt
       rust: beta
+      # no-panic link test
+    - env: TARGET=armv7-unknown-linux-gnueabihf
+      rust: nightly
 
 before_install: set -e
 

library/compiler-builtins/libm/ci/script.sh

@@ -6,19 +6,18 @@ main() {
         return
     fi
 
+    # test that the functions don't contain invocations of `panic!`
+    if [ $TRAVIS_RUST_VERSION ]; then
+        cross build --release --target $TARGET --example no-panic
+        return
+    fi
+
     # quick check
     cargo check
 
     # check that we can source import libm into compiler-builtins
     cargo check --package cb
 
-    # test that the functions don't contain invocations of `panic!`
-    case $TARGET in
-        armv7-unknown-linux-gnueabihf)
-            cross build --release --target $TARGET --example no-panic
-            ;;
-    esac
-
     # run unit tests
     cross test --lib --features checked --target $TARGET --release