Allow/fix warnings that are blocking CI

.github/workflows/coverage.yml

@@ -29,7 +29,7 @@ jobs:
 
       - name: Run cargo-tarpaulin
         run: |
-          cargo +nightly tarpaulin --manifest-path fitsio/Cargo.toml --verbose --timeout 120 --out Lcov
+          cargo +nightly tarpaulin --manifest-path fitsio/Cargo.toml --verbose --timeout 120 --out lcov
 
       - name: Coveralls
         uses: coverallsapp/github-action@master

fitsio/src/ndarray_compat.rs

@@ -366,7 +366,7 @@ mod tests {
         let phdu = f.primary_hdu().unwrap();
 
         let data: ArrayD<f64> = phdu.read_image(&mut f).unwrap();
-        let dim = data.dim();
+        let _dim = data.dim();
         assert_eq!(data.ndim(), 3);
         assert_eq!(data.shape(), &[2, 3, 6]);
         assert_eq!(data[[1, 1, 0]], 24.0);
@@ -405,7 +405,7 @@ mod tests {
         let phdu = f.primary_hdu().unwrap();
 
         let data: ArrayD<f64> = phdu.read_image(&mut f).unwrap();
-        let dim = data.dim();
+        let _dim = data.dim();
         assert_eq!(data.ndim(), 4);
         assert_eq!(data.shape(), &[2, 3, 3, 2]);
         assert_eq!(data[[1, 1, 2, 1]], 29.0);

fitsio/src/threadsafe_fitsfile.rs

@@ -34,6 +34,7 @@ impl FitsFile {
     [fits-file]: ../fitsfile/struct.FitsFile.html
      */
     pub fn threadsafe(self) -> ThreadsafeFitsFile {
+        #[allow(clippy::arc_with_non_send_sync)]
         ThreadsafeFitsFile(Arc::new(Mutex::new(self)))
     }
 }