Revert "Add io cycle detection with clircle"

This reverts commit aa2ae19dfd.

src/input.rs

@@ -1,8 +1,6 @@
-use std::convert::TryFrom;
 use std::ffi::{OsStr, OsString};
 use std::fs::File;
 use std::io::{self, BufRead, BufReader, Read};
-use std::path::Path;
 
 use content_inspector::{self, ContentType};
 
@@ -193,18 +191,6 @@ impl<'a> Input<'a> {
     }
 }
 
-impl TryFrom<&'_ Input<'_>> for clircle::Identifier {
-    type Error = ();
-
-    fn try_from(input: &Input) -> std::result::Result<clircle::Identifier, ()> {
-        match input.kind {
-            InputKind::OrdinaryFile(ref path) => Self::try_from(Path::new(path)).map_err(|_| ()),
-            InputKind::StdIn => Self::try_from(clircle::Stdio::Stdin).map_err(|_| ()),
-            InputKind::CustomReader(_) => Err(()),
-        }
-    }
-}
-
 pub(crate) struct InputReader<'a> {
     inner: Box<dyn BufRead + 'a>,
     pub(crate) first_line: Vec<u8>,