feat: Pipe

macro/src/macros.rs

@@ -0,0 +1,13 @@
+macro_rules! enum_to_tokens {
+    ($enum:ident: $($variant:ident),*) => {
+        impl ToTokens for $enum {
+            fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+                tokens.extend(match self {
+                    $(Self::$variant(variant) => quote! { #variant },)*
+                });
+            }
+        }
+    };
+}
+
+pub(crate) use enum_to_tokens;