Offchain scaffolding.

offchain/src/gp/genetic_ops.rs

@@ -0,0 +1,10 @@
+use crate::compiler::ast::{Expr};
+
+pub fn crossover(a: &Expr, b: &Expr) -> (Expr, Expr) {
+    // stub
+    (a.clone(), b.clone())
+}
+
+pub fn mutate(expr: &mut Expr) {
+    // stub
+}