diff --git a/Cargo.toml b/Cargo.toml
index cc42c54..32fa678 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ serde_derive = "1.0"
 smallvec = { version = "1.6", features = ["serde"] }
 
 [dev-dependencies]
-criterion = "0.3"
+criterion = { version = "0.3", features = ["html_reports"]}
 
 [[bench]]
 name = "bench_idl"
diff --git a/benches/bench_idl.rs b/benches/bench_idl.rs
index 145d6b7..57e3ddd 100644
--- a/benches/bench_idl.rs
+++ b/benches/bench_idl.rs
@@ -151,7 +151,7 @@ fn do_bench_duplex(c: &mut Criterion, label: &str, i: Duplex) {
         IDLBitRange::from_iter(i.1.clone()),
     );
 
-    let mut v2i = V2Duplex(
+    let v2i = V2Duplex(
         IDLBitRangeV2::from_iter(i.0.clone()),
         IDLBitRangeV2::from_iter(i.1.clone()),
     );
@@ -172,7 +172,7 @@ fn do_bench_duplex(c: &mut Criterion, label: &str, i: Duplex) {
 
     group.finish();
 
-    let mut v2i = V2Duplex(
+    let v2i = V2Duplex(
         IDLBitRangeV2::from_iter(i.0.clone()),
         IDLBitRangeV2::from_iter(i.1.clone()),
     );
diff --git a/benches/idl_simple.rs b/benches/idl_simple.rs
index ac56045..eb22f88 100644
--- a/benches/idl_simple.rs
+++ b/benches/idl_simple.rs
@@ -210,7 +210,8 @@ impl AndNot for &IDLSimple {
 
 #[cfg(test)]
 mod tests {
-    use super::{AndNot, IDLSimple};
+    use super::IDLSimple;
+    use idlset::AndNot;
     use std::iter::FromIterator;
 
     #[test]