Rename visitor, add note

README.md

@@ -62,6 +62,7 @@ of learning how to write a programming language.
 ### General
 
 http://thume.ca/2019/04/18/writing-a-compiler-in-rust/
+http://thume.ca/2019/07/14/a-tour-of-metaprogramming-models-for-generics/
 
 ### Type-checking
 https://skillsmatter.com/skillscasts/10868-inside-the-rust-compiler

schala-lang/language/src/visitor.rs

@@ -1,4 +1,4 @@
 
-pub trait Visitor {
+pub trait ASTVisitor {
 
 }