First compiling version of per-block-proc refactor

eth2/state_processing/src/per_block_processing/verify_transfer.rs

@@ -0,0 +1,19 @@
+use crate::errors::{TransferInvalid as Invalid, TransferValidationError 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_transfer(
+    state: &BeaconState,
+    transfer: &Transfer,
+    spec: &ChainSpec,
+) -> Result<(), Error> {
+    // TODO: verify transfer.
+
+    Ok(())
+}