paasio: Add PhantomData explanation (exercism#1637)

Same as the explanation present in fizzy
dem4ron · Mar 9, 2023 · 2d7f4aa · 2d7f4aa
1 parent 847baf5
commit 2d7f4aa
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/exercises/practice/paasio/src/lib.rs b/exercises/practice/paasio/src/lib.rs
@@ -1,5 +1,8 @@
 use std::io::{Read, Result, Write};
 
+// the PhantomData instances in this file are just to stop compiler complaints
+// about missing generics; feel free to remove them
+
 pub struct ReadStats<R>(::std::marker::PhantomData<R>);
 
 impl<R: Read> ReadStats<R> {