Entered supposed changes, ran cargo dev fmt, test, and bless.

Author: ofeeg

clippy_lints/src/methods/mod.rs

@@ -3197,10 +3197,10 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for initial `'/'` in an argument to `.join()` on a `Path`.
+    /// Checks for initial `'/ or \\'` in an argument to `.join()` on a `Path`.
     ///
     /// ### Why is this bad?
-    /// `.join()` comments starting with a separator, can replace the entire path.
+    /// `.join()` comments starting with a separator  (`/` or `\\`) can replace the entire path.
     /// If this is intentional, prefer creating a new `Path` instead.
     ///
     /// See [`Path::join()`](https://doc.rust-lang.org/std/path/struct.Path.html#method.join)

tests/ui/join_absolute_path.fixed

@@ -0,0 +1,26 @@
+//@run-rustfix
+#![allow(unused)]
+#![warn(clippy::join_absolute_path)]
+use std::path::Path;
+
+fn main() {
+    // should be linted
+    let path = Path::new("/bin");
+    path.join("/sh");
+    println!("{}", path.display());
+
+    //should be linted
+    let path = Path::new("C:\\Users");
+    path.join("\\user");
+    println!("{}", path.display());
+
+    // should not be linted
+    let path: &[&str] = &["/bin"];
+    path.join("/sh");
+    println!("{:?}", path);
+
+    //should not be linted
+    let path = Path::new("/bin");
+    path.join("sh");
+    println!("{}", path.display());
+}

tests/ui/join_absolute_path.rs

@@ -1,4 +1,4 @@
-// run-rustfix
+//@run-rustfix
 #![allow(unused)]
 #![warn(clippy::join_absolute_path)]
 use std::path::Path;