Combine the error types.

src/compare/error.rs

@@ -1,25 +0,0 @@
-use nom::error::ErrorKind;
-use nom::error::ParseError;
-use nom::IResult;
-
-pub type Res<T, U> = IResult<T, U, CustomError<T>>;
-
-#[derive(Debug, PartialEq)]
-pub enum CustomError<I> {
-    MyError(MyError<I>),
-    Nom(I, ErrorKind),
-}
-
-#[derive(Debug, PartialEq)]
-pub struct MyError<I>(pub I);
-
-impl<I> ParseError<I> for CustomError<I> {
-    fn from_error_kind(input: I, kind: ErrorKind) -> Self {
-        CustomError::Nom(input, kind)
-    }
-
-    fn append(_input: I, _kind: ErrorKind, mut other: Self) -> Self {
-        // Doesn't do append like VerboseError
-        other
-    }
-}

src/compare/mod.rs

@@ -1,5 +1,4 @@
 mod diff;
-mod error;
 mod parse;
 mod sexp;
 mod util;

src/compare/sexp.rs

@@ -1,3 +1,6 @@
+use crate::error::CustomError;
+use crate::error::MyError;
+use crate::error::Res;
 use std::collections::HashMap;
 
 use nom::branch::alt;
@@ -16,8 +19,6 @@ use nom::sequence::delimited;
 use nom::sequence::preceded;
 use nom::sequence::tuple;
 
-use super::error::Res;
-
 #[derive(Debug)]
 pub enum Token<'s> {
     Atom(&'s str),