First compiling version of per-block-proc refactor

eth2/state_processing/src/per_block_processing/verify_deposit.rs

@@ -0,0 +1,24 @@
+use crate::errors::{DepositInvalid as Invalid, DepositValidationError as Error};
+use ssz::TreeHash;
+use types::beacon_state::helpers::verify_bitfield_length;
+use types::*;
+
+/// Verify validity of ``slashable_attestation`` fields.
+///
+/// Returns `Ok(())` if all fields are valid.
+///
+/// Spec v0.4.0
+pub fn verify_deposit(
+    state: &BeaconState,
+    deposit: &Deposit,
+    spec: &ChainSpec,
+) -> Result<(), Error> {
+    // TODO: verify serialized deposit data.
+
+    // TODO: verify deposit index.
+    verify!(deposit.index == state.deposit_index, Invalid::BadIndex);
+
+    // TODO: verify merkle branch.
+
+    Ok(())
+}