Add untested attestation validation logic

beacon_chain/attestation_validation/src/macros.rs

@@ -0,0 +1,19 @@
+macro_rules! verify_or {
+    ($condition: expr, $result: expr) => {
+        if !$condition {
+            $result
+        }
+    };
+}
+
+macro_rules! reject {
+    ($result: expr) => {
+        return Ok(Outcome::Invalid($result));
+    };
+}
+
+macro_rules! accept {
+    () => {
+        Ok(Outcome::Valid)
+    };
+}