Add some resources

README.md

@@ -48,8 +48,12 @@ much like Haskell
 Here's a partial list of resources I've made use of in the process
 of learning how to write a programming language.
 
+### Type-checking
+https://skillsmatter.com/skillscasts/10868-inside-the-rust-compiler
+
 ### Evaluation
 *Understanding Computation*, Tom Stuart, O'Reilly 2013
+
 *Basics of Compiler Design*, Torben Mogensen
 
 ### Parsing

src/schala_lang/eval.rs

@@ -108,6 +108,19 @@ impl ReplState {
   }
 }
 
+
+// from Niko's talk
+/* fn type_check(expression, expected_ty) -> Ty {
+    let ty = bare_type_check(expression, expected_type);
+    if ty icompatible with expected_ty {
+        try_coerce(expression, ty, expected_ty)
+    } else {
+      ty
+    }
+  }
+
+  fn bare_type_check(exprssion, expected_type) -> Ty { ... }
+ */
 pub enum TypeCheck {
   OK,
   Error(String)