Attempt CI coverage report

Jenkinsfile

@@ -15,5 +15,16 @@ pipeline {
             sh "cargo test"
         }
     }
+    stage('Coverage') {
+        steps {
+            sh "cargo install cargo-tarpaulin"
+            sh "make coverage"
+        }
+    }
+  }
+  post {
+    always {
+        cobertura coberturaReportFile: '*/.xml'
+    }
   }
 }

src/rational.rs

@@ -30,7 +30,6 @@ pub struct Frac<T: Unsigned = usize> {
     sign: Sign,
 }
 
-#[macro_export]
 /// Create a [Frac](rational/struct.Frac.html) type with signed or unsigned number literals
 ///
 /// Example:
@@ -49,6 +48,7 @@ pub struct Frac<T: Unsigned = usize> {
 /// // Whole numbers and fractions
 /// frac!(1 1/2);
 /// ```
+#[macro_export]
 macro_rules! frac {
     ($w:literal $n:literal / $d:literal) => {
         frac!($w) + frac!($n / $d)