diff --git a/src/build/ir.rs b/src/build/ir.rs
index 4990316..7963002 100644
--- a/src/build/ir.rs
+++ b/src/build/ir.rs
@@ -59,12 +59,7 @@ impl Val {
         )
     }
 
-    pub fn equal(
-        &self,
-        target: &Self,
-        file_name: &str,
-        pos: Position,
-    ) -> Result<bool, error::BuildError> {
+    pub fn equal(&self, target: &Self, pos: Position) -> Result<bool, error::BuildError> {
         // first we do a type equality comparison
         match (self, target) {
             // Empty values are always equal.
@@ -78,7 +73,7 @@ impl Val {
                     Ok(false)
                 } else {
                     for (i, lv) in ldef.iter().enumerate() {
-                        try!(lv.equal(rdef[i].as_ref(), file_name, pos.clone()));
+                        try!(lv.equal(rdef[i].as_ref(), pos.clone()));
                     }
                     Ok(true)
                 }
@@ -94,11 +89,7 @@ impl Val {
                             return Ok(false);
                         } else {
                             // field value equality.
-                            if !try!(lv.1.equal(
-                                field_target.1.as_ref(),
-                                file_name,
-                                lv.0.pos.clone()
-                            )) {
+                            if !try!(lv.1.equal(field_target.1.as_ref(), lv.0.pos.clone())) {
                                 return Ok(false);
                             }
                         }
@@ -107,17 +98,17 @@ impl Val {
                 }
             }
             (&Val::Macro(_), &Val::Macro(_)) => Err(error::BuildError::new(
-                format!("Macros are not comparable in file: {}", file_name),
+                "Macros are not comparable",
                 error::ErrorType::TypeFail,
                 pos,
             )),
             (&Val::Module(_), &Val::Module(_)) => Err(error::BuildError::new(
-                format!("Module are not comparable in file: {}", file_name),
+                "Module are not comparable",
                 error::ErrorType::TypeFail,
                 pos,
             )),
             (me, tgt) => Err(error::BuildError::new(
-                format!("Types differ for {}, {} in file: {}", me, tgt, file_name),
+                format!("Types differ for {}, {}", me, tgt),
                 error::ErrorType::TypeFail,
                 pos,
             )),
diff --git a/src/build/mod.rs b/src/build/mod.rs
index e8f49da..97a3c1b 100644
--- a/src/build/mod.rs
+++ b/src/build/mod.rs
@@ -210,11 +210,7 @@ impl Builder {
             &Value::Symbol(ref s) => {
                 self.lookup_sym(&(s.into()))
                     .ok_or(Box::new(error::BuildError::new(
-                        format!(
-                            "Unable to find {} in file: {}",
-                            s.val,
-                            self.file.to_string_lossy()
-                        ),
+                        format!("Unable to find binding {}", s.val,),
                         error::ErrorType::NoSuchSymbol,
                         v.pos().clone(),
                     )))
@@ -375,9 +371,8 @@ impl Builder {
                     format!(
                         "Binding \
                          for {:?} already \
-                         exists in file: {}",
+                         exists",
                         e.key(),
-                        self.file.to_string_lossy(),
                     ),
                     error::ErrorType::DuplicateBinding,
                     def.name.pos.clone(),
@@ -480,10 +475,8 @@ impl Builder {
                 format!(
                     "Unable to \
                      match element {} in selector \
-                     path [{}] in file: {}",
-                    next.1,
-                    sl,
-                    self.file.to_string_lossy(),
+                     path [{}]",
+                    next.1, sl,
                 ),
                 error::ErrorType::NoSuchSymbol,
                 next.0.clone(),
@@ -507,10 +500,8 @@ impl Builder {
                 format!(
                     "Unable to \
                      match element {} in selector \
-                     path [{}] in file: {}",
-                    next.1,
-                    sl,
-                    self.file.to_string_lossy(),
+                     path [{}]",
+                    next.1, sl,
                 ),
                 error::ErrorType::NoSuchSymbol,
                 next.0.clone(),
@@ -720,11 +711,9 @@ impl Builder {
         left: Rc<Val>,
         right: Rc<Val>,
     ) -> Result<Rc<Val>, Box<Error>> {
-        Ok(Rc::new(Val::Boolean(try!(left.equal(
-            right.as_ref(),
-            &self.file.to_string_lossy(),
-            pos.clone()
-        )))))
+        Ok(Rc::new(Val::Boolean(try!(
+            left.equal(right.as_ref(), pos.clone())
+        ))))
     }
 
     fn do_not_deep_equal(
@@ -733,11 +722,9 @@ impl Builder {
         left: Rc<Val>,
         right: Rc<Val>,
     ) -> Result<Rc<Val>, Box<Error>> {
-        Ok(Rc::new(Val::Boolean(!try!(left.equal(
-            right.as_ref(),
-            &self.file.to_string_lossy(),
-            pos.clone()
-        )))))
+        Ok(Rc::new(Val::Boolean(!try!(
+            left.equal(right.as_ref(), pos.clone())
+        ))))
     }
 
     fn do_gt(&self, pos: &Position, left: Rc<Val>, right: Rc<Val>) -> Result<Rc<Val>, Box<Error>> {
diff --git a/src/build/test.rs b/src/build/test.rs
index 37cc3ae..5372347 100644
--- a/src/build/test.rs
+++ b/src/build/test.rs
@@ -140,7 +140,7 @@ fn test_eval_simple_lookup_error() {
 
 // Include nested for each.
 #[test]
-#[should_panic(expected = "Unable to find tpl1")]
+#[should_panic(expected = "Unable to find binding tpl1")]
 fn test_expr_copy_no_such_tuple() {
     let cache = Rc::new(RefCell::new(MemoryCache::new()));
     let b = Builder::new(std::env::current_dir().unwrap(), cache);
@@ -221,7 +221,7 @@ fn test_expr_copy_field_type_error() {
 }
 
 #[test]
-#[should_panic(expected = "Unable to find arg1")]
+#[should_panic(expected = "Unable to find binding arg1")]
 fn test_macro_hermetic() {
     let cache = Rc::new(RefCell::new(MemoryCache::new()));
     let mut b = Builder::new(std::env::current_dir().unwrap(), cache);