diff --git a/lighthouse/main.rs b/lighthouse/main.rs
index 0b678fa46..c90bcdaea 100644
--- a/lighthouse/main.rs
+++ b/lighthouse/main.rs
@@ -23,7 +23,7 @@ mod config;
 
 use std::path::PathBuf;
 
-use slog::{ Drain, Logger };
+use slog::Drain;
 use clap::{ Arg, App };
 use config::LighthouseConfig;
 use client::Client;
diff --git a/lighthouse/state/attestation_record/validation/attestation_validation.rs b/lighthouse/state/attestation_record/validation/attestation_validation.rs
index 24ffc291b..5070ebb44 100644
--- a/lighthouse/state/attestation_record/validation/attestation_validation.rs
+++ b/lighthouse/state/attestation_record/validation/attestation_validation.rs
@@ -65,8 +65,6 @@ pub fn validate_attestation<T>(a: &AttestationRecord,
     -> Result<Option<HashSet<usize>>, AttestationValidationError>
     where T: ClientDB + Sized
 {
-    // TODO: assert attestion isn't already known
-
     /*
      * The attesation slot must not be higher than the block that contained it.
      */
diff --git a/lighthouse/state/block/validation/mod.rs b/lighthouse/state/block/validation/mod.rs
index 70c37e219..59aa3fc15 100644
--- a/lighthouse/state/block/validation/mod.rs
+++ b/lighthouse/state/block/validation/mod.rs
@@ -3,7 +3,6 @@ mod validate_ssz_block;
 mod tests;
 
 use super::attestation_record;
-use super::Block;
 use super::SszBlock;
 use super::db;
 use super::ssz;