diff --git a/src/lib.rs b/src/lib.rs
index 71a6b31..a934b8f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,3 @@
-use std::error::Error;
 use std::io;
 use std::num::ParseIntError;
 use std::ops::{Index, Range};
@@ -23,17 +22,17 @@ impl Segmenter {
     ///
     /// Note: the `String` types used in this API are defined in the `smartstring` crate. Any
     /// `&str` or `String` can be converted into the `String` used here by calling `into()` on it.
-    pub fn from_iters<U, B>(unigrams: U, bigrams: B) -> Result<Self, Box<dyn Error>>
+    pub fn from_iters<U, B>(unigrams: U, bigrams: B) -> Self
     where
-        U: Iterator<Item = Result<(String, f64), Box<dyn Error>>>,
-        B: Iterator<Item = Result<((String, String), f64), Box<dyn Error>>>,
+        U: Iterator<Item = (String, f64)>,
+        B: Iterator<Item = ((String, String), f64)>,
     {
-        Ok(Self {
-            unigrams: unigrams.collect::<Result<HashMap<_, _>, _>>()?,
-            bigrams: bigrams.collect::<Result<HashMap<_, _>, _>>()?,
+        Self {
+            unigrams: unigrams.collect::<HashMap<_, _>>(),
+            bigrams: bigrams.collect::<HashMap<_, _>>(),
             limit: DEFAULT_LIMIT,
             total: DEFAULT_TOTAL,
-        })
+        }
     }
 
     /// Appends list of words that is the best segmentation of `text` to `out`
diff --git a/src/test_data.rs b/src/test_data.rs
index 39f37c3..1d9119d 100644
--- a/src/test_data.rs
+++ b/src/test_data.rs
@@ -13,37 +13,36 @@ pub fn segmenter() -> Segmenter {
     let uni_file = dir.join("unigrams.txt");
     let reader = BufReader::new(File::open(&uni_file).unwrap());
     let unigrams = reader.lines().enumerate().map(move |(i, ln)| {
-        let ln = ln?;
+        let ln = ln.expect(&format!("line error at {:?}:{}", uni_file, i));
         let split = ln
             .find('\t')
-            .ok_or_else(|| format!("no tab found in {:?}:{}", uni_file, i))?;
+            .expect(&format!("no tab found in {:?}:{}", uni_file, i));
 
         let word = ln[..split].into();
-        let p = usize::from_str(&ln[split + 1..])
-            .map_err(|e| format!("error at {:?}:{}: {}", uni_file, i, e))?;
-        Ok((word, p as f64))
+        let p = usize::from_str(&ln[split + 1..]).expect(&format!("error at {:?}:{}", uni_file, i));
+        (word, p as f64)
     });
 
     let bi_file = dir.join("bigrams.txt");
     let reader = BufReader::new(File::open(&bi_file).unwrap());
     let bigrams = reader.lines().enumerate().map(move |(i, ln)| {
-        let ln = ln?;
+        let ln = ln.expect(&format!("line error at {:?}:{}", bi_file, i));
         let word_split = ln
             .find(' ')
-            .ok_or_else(|| format!("no space found in {:?}:{}", bi_file, i))?;
+            .expect(&format!("no space found in {:?}:{}", bi_file, i));
         let score_split = ln[word_split + 1..]
             .find('\t')
-            .ok_or_else(|| format!("no tab found in {:?}:{}", bi_file, i))?
+            .expect(&format!("no tab found in {:?}:{}", bi_file, i))
             + word_split
             + 1;
 
         let word1 = ln[..word_split].into();
         let word2 = ln[word_split + 1..score_split].into();
         let p = usize::from_str(&ln[score_split + 1..])
-            .map_err(|e| format!("error at {:?}:{}: {}", bi_file, i, e))?;
+            .expect(&format!("error at {:?}:{}", bi_file, i));
 
-        Ok(((word1, word2), p as f64))
+        ((word1, word2), p as f64)
     });
 
-    Segmenter::from_iters(unigrams, bigrams).unwrap()
+    Segmenter::from_iters(unigrams, bigrams)
 }