diff --git a/src/build/compile_test.rs b/src/build/compile_test.rs
index 65186f8..2cbfc25 100644
--- a/src/build/compile_test.rs
+++ b/src/build/compile_test.rs
@@ -12,9 +12,6 @@
 //  See the License for the specific language governing permissions and
 //  limitations under the License.
 
-use std::cell::RefCell;
-use std::rc::Rc;
-
 use regex::Regex;
 
 //TODO(jwall): use super::assets::MemoryCache;
diff --git a/src/build/format.rs b/src/build/format.rs
index 5ae95ce..b961961 100644
--- a/src/build/format.rs
+++ b/src/build/format.rs
@@ -110,7 +110,7 @@ impl ExpressionTemplate {
         let i = SliceIter::new(&toks);
         match parse::expression(i) {
             ParseResult::Complete(_, expr) => Ok(expr),
-            ParseResult::Abort(e) | ParseResult::Fail(e) => {
+            ParseResult::Abort(_e) | ParseResult::Fail(_e) => {
                 panic!("TODO(jwall): make this not a thing")
             }
             ParseResult::Incomplete(_ei) => panic!("TODO(jwall): make this not a thing"),
diff --git a/src/build/ir.rs b/src/build/ir.rs
index aa05a00..bbbe1e3 100644
--- a/src/build/ir.rs
+++ b/src/build/ir.rs
@@ -6,7 +6,6 @@ use std::fmt::{Display, Formatter};
 use std::rc::Rc;
 use std::string::ToString;
 
-use crate::ast::*;
 use crate::error;
 
 /// The Intermediate representation of a compiled UCG AST.
diff --git a/src/build/mod.rs b/src/build/mod.rs
index d342465..afbe0d5 100644
--- a/src/build/mod.rs
+++ b/src/build/mod.rs
@@ -47,11 +47,6 @@ mod stdlib;
 
 pub use self::ir::Val;
 
-enum ProcessingOpType {
-    Map,
-    Filter,
-}
-
 /// The result of a build.
 type BuildResult = Result<(), Box<dyn Error>>;
 
diff --git a/src/build/opcode/mod.rs b/src/build/opcode/mod.rs
index 58a692b..eb666a1 100644
--- a/src/build/opcode/mod.rs
+++ b/src/build/opcode/mod.rs
@@ -11,8 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-use std::collections::BTreeSet;
-use std::convert::{TryFrom, TryInto};
 use std::rc::Rc;
 
 mod cache;
diff --git a/src/build/test.rs b/src/build/test.rs
index 39ee240..f05698b 100644
--- a/src/build/test.rs
+++ b/src/build/test.rs
@@ -11,14 +11,10 @@
 //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 //  See the License for the specific language governing permissions and
 //  limitations under the License.
-use super::assets;
-use super::assets::MemoryCache;
-use super::{FileBuilder, SelectDef, Val};
+use super::{FileBuilder, Val};
 use crate::ast::*;
-use crate::convert::ConverterRegistry;
 
 use std;
-use std::cell::RefCell;
 use std::rc::Rc;
 
 fn test_expr_to_val<'a, O, E>(mut cases: Vec<(Expression, Val)>, mut b: FileBuilder<'a, O, E>)
@@ -35,8 +31,6 @@ where
 #[should_panic(expected = "Expected Float")]
 fn test_eval_div_expr_fail() {
     let i_paths = Vec::new();
-    let cache = Rc::new(RefCell::new(MemoryCache::new()));
-    let registry = ConverterRegistry::make_registry();
     let out: Vec<u8> = Vec::new();
     let err: Vec<u8> = Vec::new();
     let b = FileBuilder::new(std::env::current_dir().unwrap(), &i_paths, out, err);
diff --git a/src/error.rs b/src/error.rs
index 679d43e..4aea57c 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -108,6 +108,7 @@ impl BuildError {
 
     fn render(&self, w: &mut fmt::Formatter) -> fmt::Result {
         if let Some(ref pos) = self.pos {
+            // FIXME(jwall): we should still be printing the file here.
             let file = match pos.file {
                 Some(ref pb) => pb.to_string_lossy().to_string(),
                 None => "<eval>".to_string(),
diff --git a/src/main.rs b/src/main.rs
index 3003c43..c0c795b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,15 +23,12 @@ use std::error::Error;
 use std::fs::File;
 use std::io;
 use std::io::Read;
-use std::io::{Stderr, Stdout};
 use std::path::{Path, PathBuf};
 use std::process;
 use std::rc::Rc;
 
 use ucglib::build;
-use ucglib::build::assets::{Cache, MemoryCache};
-use ucglib::build::Val;
-use ucglib::convert::traits;
+use ucglib::build::assets::{MemoryCache};
 use ucglib::convert::{ConverterRegistry, ImporterRegistry};
 use ucglib::iter::OffsetStrIter;
 use ucglib::parse::parse;