std: Remove old_io/old_path from the prelude

This commit removes the reexports of `old_io` traits as well as `old_path` types
and traits from the prelude. This functionality is now all deprecated and needs
to be removed to make way for other functionality like `Seek` in the `std::io`
module (currently reexported as `NewSeek` in the io prelude).

Closes #23377
Closes #23378

src/libstd/old_io/process.rs

@@ -24,8 +24,9 @@ use collections::HashMap;
 use ffi::CString;
 use fmt;
 use old_io::pipe::{PipeStream, PipePair};
-use old_io::{IoResult, IoError};
+use old_io::{IoResult, IoError, Reader, Writer};
 use old_io;
+use old_path::{Path, GenericPath};
 use libc;
 use os;
 use old_path::BytesContainer;
@@ -60,7 +61,7 @@ use thread;
 /// # Examples
 ///
 /// ```should_fail
-/// use std::old_io::Command;
+/// use std::old_io::*;
 ///
 /// let mut child = match Command::new("/bin/cat").arg("file.txt").spawn() {
 ///     Ok(child) => child,
@@ -163,7 +164,7 @@ pub type EnvMap = HashMap<EnvKey, CString>;
 /// to be changed (for example, by adding arguments) prior to spawning:
 ///
 /// ```
-/// use std::old_io::Command;
+/// use std::old_io::*;
 ///
 /// let mut process = match Command::new("sh").arg("-c").arg("echo hello").spawn() {
 ///   Ok(p) => p,
@@ -759,9 +760,11 @@ impl Drop for Process {
 #[cfg(test)]
 mod tests {
     use old_io::{Truncate, Write, TimedOut, timer, process, FileNotFound};
-    use prelude::v1::{Ok, Err, range, drop, Some, None, Vec};
-    use prelude::v1::{Path, String, Reader, Writer, Clone};
-    use prelude::v1::{Str, AsSlice, ToString, GenericPath};
+    use old_io::{Reader, Writer};
+    use prelude::v1::{Ok, Err, drop, Some, None, Vec};
+    use prelude::v1::{String, Clone};
+    use prelude::v1::{Str, AsSlice, ToString};
+    use old_path::{GenericPath, Path};
     use old_io::fs::PathExtensions;
     use old_io::timer::*;
     use rt::running_on_valgrind;