Add getter for NamedSource name

src/named_source.rs

@@ -27,6 +27,11 @@ impl NamedSource {
         }
     }
 
+    /// Gets the name of this `NamedSource`.
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+
     /// Returns a reference the inner [`SourceCode`] type for this
     /// `NamedSource`.
     pub fn inner(&self) -> &(dyn SourceCode + 'static) {