Make some progress on ASTs.

offchain/src/gp/genetic_ops.rs

@@ -1,10 +1,10 @@
-use crate::compiler::ast::{Expr};
+// use crate::compiler::ast::{Expr};
 
-pub fn crossover(a: &Expr, b: &Expr) -> (Expr, Expr) {
-    // stub
-    (a.clone(), b.clone())
-}
+// pub fn crossover(a: &Expr, b: &Expr) -> (Expr, Expr) {
+//     // stub
+//     (a.clone(), b.clone())
+// }
 
-pub fn mutate(expr: &mut Expr) {
-    // stub
-}
+// pub fn mutate(expr: &mut Expr) {
+//     // stub
+// }