diff --git a/pkgs/development/compilers/rust/0001-Allow-getting-no_std-from-the-config-file.patch b/pkgs/development/compilers/rust/0001-Allow-getting-no_std-from-the-config-file.patch
deleted file mode 100644
index 0b9359221a78..000000000000
--- a/pkgs/development/compilers/rust/0001-Allow-getting-no_std-from-the-config-file.patch
+++ /dev/null
@@ -1,52 +0,0 @@
-From 036c87c82793f1da9f98445e8e27462cc19bbe0a Mon Sep 17 00:00:00 2001
-From: John Ericson <John.Ericson@Obsidian.Systems>
-Date: Sat, 22 Feb 2020 14:38:38 -0500
-Subject: [PATCH] Allow getting `no_std` from the config file
-
-Currently, it is only set correctly in the sanity checking implicit
-default fallback code. Having a config file at all will for force
-`no_std = false`.
----
- src/bootstrap/config.rs | 3 +++
- src/bootstrap/sanity.rs | 4 +---
- 2 files changed, 4 insertions(+), 3 deletions(-)
-
-diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
-index 110c8b844d5..83a6934d477 100644
---- a/src/bootstrap/config.rs
-+++ b/src/bootstrap/config.rs
-@@ -350,6 +350,7 @@ struct TomlTarget {
-     musl_root: Option<String>,
-     wasi_root: Option<String>,
-     qemu_rootfs: Option<String>,
-+    no_std: Option<bool>,
- }
- 
- impl Config {
-@@ -610,6 +611,8 @@ impl Config {
-                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
-                 target.wasi_root = cfg.wasi_root.clone().map(PathBuf::from);
-                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
-+                target.no_std
-+                    = cfg.no_std.unwrap_or(triple.contains("-none-") || triple.contains("nvptx"));
- 
-                 config.target_config.insert(INTERNER.intern_string(triple.clone()), target);
-             }
-diff --git a/src/bootstrap/sanity.rs b/src/bootstrap/sanity.rs
-index 8ff7056e628..76e721ed8e3 100644
---- a/src/bootstrap/sanity.rs
-+++ b/src/bootstrap/sanity.rs
-@@ -194,9 +194,7 @@ pub fn check(build: &mut Build) {
- 
-         if target.contains("-none-") || target.contains("nvptx") {
-             if build.no_std(*target).is_none() {
--                let target = build.config.target_config.entry(target.clone()).or_default();
--
--                target.no_std = true;
-+                build.config.target_config.entry(target.clone()).or_default();
-             }
- 
-             if build.no_std(*target) == Some(false) {
--- 
-2.24.1
-
diff --git a/pkgs/development/compilers/rust/1_42.nix b/pkgs/development/compilers/rust/1_42.nix
deleted file mode 100644
index 8717aaf76a23..000000000000
--- a/pkgs/development/compilers/rust/1_42.nix
+++ /dev/null
@@ -1,44 +0,0 @@
-# New rust versions should first go to staging.
-# Things to check after updating:
-# 1. Rustc should produce rust binaries on x86_64-linux, aarch64-linux and x86_64-darwin:
-#    i.e. nix-shell -p fd or @GrahamcOfBorg build fd on github
-#    This testing can be also done by other volunteers as part of the pull
-#    request review, in case platforms cannot be covered.
-# 2. The LLVM version used for building should match with rust upstream.
-# 3. Firefox and Thunderbird should still build on x86_64-linux.
-
-{ stdenv, lib
-, buildPackages
-, newScope, callPackage
-, CoreFoundation, Security
-, llvmPackages_5
-, pkgsBuildTarget, pkgsBuildBuild
-} @ args:
-
-import ./default.nix {
-  rustcVersion = "1.42.0";
-  rustcSha256 = "0x9lxs82may6c0iln0b908cxyn1cv7h03n5cmbx3j1bas4qzks6j";
-
-  # Note: the version MUST be one version prior to the version we're
-  # building
-  bootstrapVersion = "1.41.0";
-
-  # fetch hashes by running `print-hashes.sh 1.42.0`
-  bootstrapHashes = {
-    i686-unknown-linux-gnu = "a93a34f9cf3d35de2496352cb615b42b792eb09db3149b3a278efd2c58fa7897";
-    x86_64-unknown-linux-gnu = "343ba8ef7397eab7b3bb2382e5e4cb08835a87bff5c8074382c0b6930a41948b";
-    arm-unknown-linux-gnueabihf = "d0b33fcc97eeb96d716b30573c7e66affdf9077ecdecb30df2498b49f8284047";
-    armv7-unknown-linux-gnueabihf = "3c8e787fb4f4f304a065e78c38010f0b5722d809f9dafb0e904084bf0f54f7be";
-    aarch64-unknown-linux-gnu = "79ddfb5e2563d0ee09a567fbbe121a2aed3c3bc61255b2787f2dd42183a10f27";
-    i686-apple-darwin = "628134b3fbaf5c0e7a25bd9a2b8d25f6e68bb256c8b04a3332ec979f5a1cd339";
-    x86_64-apple-darwin = "b6504003ab70b11f278e0243a43ba9d6bf75e8ad6819b4058a2b6e3991cc8d7a";
-  };
-
-  selectRustPackage = pkgs: pkgs.rust_1_42;
-
-  rustcPatches = [
-    ./0001-Allow-getting-no_std-from-the-config-file.patch
-  ];
-}
-
-(builtins.removeAttrs args [ "fetchpatch" ])
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0a168f160648..2e6545c0c5b9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9199,15 +9199,11 @@ in
     inherit (darwin) apple_sdk;
   };
 
-  rust_1_42 = callPackage ../development/compilers/rust/1_42.nix {
-    inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
-  };
   rust_1_44 = callPackage ../development/compilers/rust/1_44.nix {
     inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
   };
   rust = rust_1_44;
 
-  rustPackages_1_42 = rust_1_42.packages.stable;
   rustPackages_1_44 = rust_1_44.packages.stable;
   rustPackages = rustPackages_1_44;
 
@@ -22550,7 +22546,6 @@ in
   thonny = callPackage ../applications/editors/thonny { };
 
   thunderbird = callPackage ../applications/networking/mailreaders/thunderbird {
-    inherit (rustPackages_1_42) rustc;
     libpng = libpng_apng;
     gtk3Support = true;
   };