Use a different approach to remove \ and / from the start of the given path

Author: andrehjr

clippy_lints/src/path_buf_push_overwrite.rs

@@ -55,15 +55,14 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for PathBufPushOverwrite {
             if pushed_path.has_root();
             if let Some(root) = pushed_path.components().next();
             if root == Component::RootDir;
-            if let Some(root_str) = root.as_os_str().to_str();
             then {
                 span_lint_and_sugg(
                     cx,
                     PATH_BUF_PUSH_OVERWRITE,
                     lit.span,
-                    &format!("Calling `push` with '{}' (file system root) will overwrite the previous path definition", root_str),
-                    &format!("Remove '{}' from the beginning of the given path", root_str),
-                    format!("\"{}\"", pushed_path_lit.trim_start_matches(root_str)),
+                    "Calling `push` with '/' or '\\' (file system root) will overwrite the previous path definition",
+                    "try",
+                    format!("\"{}\"", pushed_path_lit.trim_start_matches(|c| c == '/' || c == '\\')),
                     Applicability::MachineApplicable,
                 );
             }

tests/ui/path_buf_push_overwrite.stderr

@@ -1,8 +1,8 @@
-error: Calling `push` with '/' (file system root) will overwrite the previous path definition
+error: Calling `push` with '/' or '/' (file system root) will overwrite the previous path definition
   --> $DIR/path_buf_push_overwrite.rs:6:12
    |
 LL |     x.push("/bar");
-   |            ^^^^^^ help: Remove '/' from the beginning of the given path: `"bar"`
+   |            ^^^^^^ help: try: `"bar"`
    |
    = note: #[deny(clippy::path_buf_push_overwrite)] on by default