Remove unused libc dependency and minimal failure dependency.

Failure is replaced with finalfusion's error handling.

Author: sebpuetz

Cargo.lock

@@ -20,9 +20,7 @@ features = ["extension-module"]
 
 [dependencies]
 itertools = "0.8"
-failure = "0.1"
 finalfusion = { git = "https://github.com/finalfusion/finalfusion-rust", rev = "66388fe0e46c45d009ffdb8342c76fcb8c9c64d3"}
-libc = "0.2"
 ndarray = "0.12"
 numpy = "0.7"
 toml = "0.5"

Cargo.toml

@@ -4,7 +4,6 @@ use std::fs::File;
 use std::io::{BufReader, BufWriter};
 use std::rc::Rc;
 
-use failure::Error;
 use finalfusion::chunks::metadata::Metadata;
 use finalfusion::compat::text::{ReadText, ReadTextDims};
 use finalfusion::compat::word2vec::ReadWord2Vec;
@@ -373,11 +372,12 @@ impl PyIterProtocol for PyEmbeddings {
     }
 }
 
-fn read_embeddings<S>(path: &str, mmap: bool) -> Result<Embeddings<VocabWrap, S>, Error>
+fn read_embeddings<S>(path: &str, mmap: bool) -> Result<Embeddings<VocabWrap, S>, ffio::Error>
 where
     Embeddings<VocabWrap, S>: ReadEmbeddings + MmapEmbeddings,
 {
-    let f = File::open(path)?;
+    let f = File::open(path)
+        .map_err(|e| ffio::ErrorKind::io_error("Cannot open embeddings file for reading", e))?;
     let mut reader = BufReader::new(f);
 
     let embeddings = if mmap {