Create helper Result<T> type

src/host.rs

@@ -3,7 +3,7 @@
 //! still largely reflects that.
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
-
+use crate::Result;
 use std::{io, slice, str};
 
 pub type void = ::std::os::raw::c_void;
@@ -499,7 +499,7 @@ pub unsafe fn iovec_to_host_mut<'a>(iovec: &'a mut __wasi_iovec_t) -> io::IoSlic
 ///
 /// NB WASI spec requires bytes to be valid UTF-8. Otherwise,
 /// `__WASI_EILSEQ` error is returned.
-pub fn path_from_slice<'a>(s: &'a [u8]) -> Result<&'a str, __wasi_errno_t> {
+pub fn path_from_slice<'a>(s: &'a [u8]) -> Result<&'a str> {
     str::from_utf8(s).map_err(|_| __WASI_EILSEQ)
 }
 
@@ -507,7 +507,7 @@ pub fn path_from_slice<'a>(s: &'a [u8]) -> Result<&'a str, __wasi_errno_t> {
 ///
 /// NB WASI spec requires bytes to be valid UTF-8. Otherwise,
 /// `__WASI_EILSEQ` error is returned.
-pub fn path_from_vec<S: Into<Vec<u8>>>(s: S) -> Result<String, __wasi_errno_t> {
+pub fn path_from_vec<S: Into<Vec<u8>>>(s: S) -> Result<String> {
     String::from_utf8(s.into()).map_err(|_| __WASI_EILSEQ)
 }