Factor out PathUpdateMethod type

As a private type, PathUpdateMethod cannot be referenced
from other files without leaking. This refactors it into
a public type kept private to the module.

Author: workingjubilee

src/cli/self_update.rs

@@ -47,6 +47,8 @@ use std::env::consts::EXE_SUFFIX;
 use std::fs;
 use std::path::{Component, Path, PathBuf};
 use std::process::{self, Command};
+mod types;
+use types::PathUpdateMethod;
 
 pub struct InstallOpts<'a> {
     pub default_host_triple: Option<String>,
@@ -1118,12 +1120,6 @@ pub fn complete_windows_uninstall() -> Result<()> {
     panic!("stop doing that")
 }
 
-#[derive(PartialEq)]
-enum PathUpdateMethod {
-    RcFile(PathBuf),
-    Windows,
-}
-
 /// Decide which rcfiles we're going to update, so we
 /// can tell the user before they confirm.
 fn get_add_path_methods() -> Vec<PathUpdateMethod> {

src/cli/self_update/types.rs

@@ -0,0 +1,8 @@
+#![allow(dead_code)]
+use std::path::PathBuf;
+
+#[derive(PartialEq)]
+pub enum PathUpdateMethod {
+    RcFile(PathBuf),
+    Windows,
+}