chain: a prototype is added.

I have an ostensibly working prototype now.

Further tests are needed to make sure that the algorithm meets the
time complexity requirement, though.

1 files changed, 8 insertions, 1 deletions

diff --git a/graph_macro/src/lib.rs b/graph_macro/src/lib.rs
index 5a0672b..a55efbb 100644
--- a/graph_macro/src/lib.rs
+++ b/graph_macro/src/lib.rs
@@ -1,12 +1,19 @@
+#![allow(unused_imports)]
 //! This file provides a macro to delegate the implementation of a
 //! type that wraps a graph.  More precisely, the macro helps the
 //! wrapper type implement the various Graph-related traits.
 
 use proc_macro::TokenStream;
 
+use core::iter::Peekable;
+
 #[proc_macro_derive(Testing)]
 pub fn test_derive(input: TokenStream) -> TokenStream {
-    println!("input: {input:?}");
+    let input = input.into_iter().peekable();
+
+    for tree in input {
+        println!("tree = {tree:?}");
+    }
 
     TokenStream::new()
 }