Revert "rustfmt: actually fix the failing test"

This reverts commit 6eb00a41a0.

fixed in 1.60.0

pkgs/development/compilers/rust/rustfmt-fix-self-tests.patch

@@ -1,13 +0,0 @@
---- a/src/tools/rustfmt/src/ignore_path.rs
-+++ b/src/tools/rustfmt/src/ignore_path.rs
-@@ -37,9 +37,9 @@
-     #[nightly_only_test]
-     #[test]
-     fn test_ignore_path_set() {
--        use std::path::{Path, PathBuf};
-         use crate::config::{Config, FileName};
-         use crate::ignore_path::IgnorePathSet;
-+        use std::path::{Path, PathBuf};
- 
-         let config =
-             Config::from_toml(r#"ignore = ["foo.rs", "bar_dir/*"]"#, Path::new("")).unwrap();

pkgs/development/compilers/rust/rustfmt.nix

@@ -21,9 +21,6 @@ rustPlatform.buildRustPackage rec {
   CFG_RELEASE = rustPlatform.rust.rustc.version;
   CFG_RELEASE_CHANNEL = if asNightly then "nightly" else "stable";
 
-  # FIXME: seems fixed upstream, remove after the next update
-  patches = [ ./rustfmt-fix-self-tests.patch ];
-
   meta = with lib; {
     description = "A tool for formatting Rust code according to style guidelines";
     homepage = "https://github.com/rust-lang-nursery/rustfmt";