diff --git a/compiler/rustc_feature/src/tests.rs b/compiler/rustc_feature/src/tests.rs
index 50433e44b1350..eb7dce94a0595 100644
--- a/compiler/rustc_feature/src/tests.rs
+++ b/compiler/rustc_feature/src/tests.rs
@@ -1,6 +1,7 @@
 use super::UnstableFeatures;
 
 #[test]
+#[allow(deprecated, deprecated_in_future)]
 fn rustc_bootstrap_parsing() {
     let is_bootstrap = |env, krate| {
         std::env::set_var("RUSTC_BOOTSTRAP", env);
diff --git a/compiler/rustc_interface/src/passes.rs b/compiler/rustc_interface/src/passes.rs
index b073ee9682fbd..beaf15a4762fe 100644
--- a/compiler/rustc_interface/src/passes.rs
+++ b/compiler/rustc_interface/src/passes.rs
@@ -257,6 +257,7 @@ fn pre_expansion_lint(
 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
 /// harness if one is to be provided, injection of a dependency on the
 /// standard library and prelude, and name resolution.
+#[allow(deprecated, deprecated_in_future)]
 pub fn configure_and_expand(
     sess: &Session,
     lint_store: &LintStore,
diff --git a/library/std/src/env.rs b/library/std/src/env.rs
index c6af708f6cd0a..4fd3b0c77dba4 100644
--- a/library/std/src/env.rs
+++ b/library/std/src/env.rs
@@ -327,6 +327,10 @@ impl Error for VarError {
 /// assert_eq!(env::var(key), Ok("VALUE".to_string()));
 /// ```
 #[stable(feature = "env", since = "1.0.0")]
+#[rustc_deprecated(
+    since = "1.58.0",
+    reason = "unclear soundness on POSIX, use `libc::setenv` or `std::process::Command::env` instead"
+)]
 pub fn set_var<K: AsRef<OsStr>, V: AsRef<OsStr>>(key: K, value: V) {
     _set_var(key.as_ref(), value.as_ref())
 }
@@ -369,6 +373,10 @@ fn _set_var(key: &OsStr, value: &OsStr) {
 /// assert!(env::var(key).is_err());
 /// ```
 #[stable(feature = "env", since = "1.0.0")]
+#[rustc_deprecated(
+    since = "1.58.0",
+    reason = "unclear soundness on POSIX, use `libc::unsetenv` or `std::process::Command::env_remove` instead"
+)]
 pub fn remove_var<K: AsRef<OsStr>>(key: K) {
     _remove_var(key.as_ref())
 }
diff --git a/library/std/src/process/tests.rs b/library/std/src/process/tests.rs
index bc71c150550a4..3555a332328ab 100644
--- a/library/std/src/process/tests.rs
+++ b/library/std/src/process/tests.rs
@@ -260,6 +260,7 @@ fn test_add_to_env() {
 
 #[test]
 #[cfg_attr(target_os = "vxworks", ignore)]
+#[allow(deprecated, deprecated_in_future)]
 fn test_capture_env_at_spawn() {
     use crate::env;
 
diff --git a/library/std/src/sys/windows/process/tests.rs b/library/std/src/sys/windows/process/tests.rs
index 3b65856dcaca6..b1aea13f36e56 100644
--- a/library/std/src/sys/windows/process/tests.rs
+++ b/library/std/src/sys/windows/process/tests.rs
@@ -73,6 +73,7 @@ fn test_make_command_line() {
 // On Windows, environment args are case preserving but comparisons are case-insensitive.
 // See: #85242
 #[test]
+#[allow(deprecated, deprecated_in_future)]
 fn windows_env_unicode_case() {
     let test_cases = [
         ("ä", "Ä"),
diff --git a/library/std/src/sys_common/process.rs b/library/std/src/sys_common/process.rs
index 2cd1e29f6c45d..b11f5a52eb87f 100644
--- a/library/std/src/sys_common/process.rs
+++ b/library/std/src/sys_common/process.rs
@@ -40,6 +40,7 @@ impl CommandEnv {
     }
 
     // Apply these changes directly to the current environment
+    #[allow(deprecated, deprecated_in_future)]
     pub fn apply(&self) {
         if self.clear {
             for (k, _) in env::vars_os() {
diff --git a/library/std/tests/env.rs b/library/std/tests/env.rs
index b095c2dde6285..2874b9be3368f 100644
--- a/library/std/tests/env.rs
+++ b/library/std/tests/env.rs
@@ -1,3 +1,5 @@
+#![allow(deprecated, deprecated_in_future)]
+
 use std::env::*;
 use std::ffi::{OsStr, OsString};
 
diff --git a/library/test/src/lib.rs b/library/test/src/lib.rs
index 99d951d8016bb..4a46bc9373941 100644
--- a/library/test/src/lib.rs
+++ b/library/test/src/lib.rs
@@ -151,6 +151,7 @@ pub fn test_main_static(tests: &[&TestDescAndFn]) {
 ///
 /// This is the entry point for the main function generated by `rustc --test`
 /// when panic=abort.
+#[allow(deprecated, deprecated_in_future)]
 pub fn test_main_static_abort(tests: &[&TestDescAndFn]) {
     // If we're being run in SpawnedSecondary mode, run the test here. run_test
     // will then exit the process.
diff --git a/library/test/src/term/terminfo/searcher/tests.rs b/library/test/src/term/terminfo/searcher/tests.rs
index 4227a585e2f59..297029943d7cd 100644
--- a/library/test/src/term/terminfo/searcher/tests.rs
+++ b/library/test/src/term/terminfo/searcher/tests.rs
@@ -2,6 +2,7 @@ use super::*;
 
 #[test]
 #[ignore = "buildbots don't have ncurses installed and I can't mock everything I need"]
+#[allow(deprecated, deprecated_in_future)]
 fn test_get_dbpath_for_term() {
     // woefully inadequate test coverage
     // note: current tests won't work with non-standard terminfo hierarchies (e.g., macOS's)
diff --git a/src/build_helper/lib.rs b/src/build_helper/lib.rs
index b1ec072f3f8aa..21e0038dbd843 100644
--- a/src/build_helper/lib.rs
+++ b/src/build_helper/lib.rs
@@ -46,6 +46,7 @@ pub fn tracked_env_var_os<K: AsRef<OsStr> + Display>(key: K) -> Option<OsString>
 // the one we want to use. As such, we restore the environment to what bootstrap saw. This isn't
 // perfect -- we might actually want to see something from Cargo's added library paths -- but
 // for now it works.
+#[allow(deprecated, deprecated_in_future)]
 pub fn restore_library_path() {
     let key = tracked_env_var_os("REAL_LIBRARY_PATH_VAR").expect("REAL_LIBRARY_PATH_VAR");
     if let Some(env) = tracked_env_var_os("REAL_LIBRARY_PATH") {
diff --git a/src/test/ui/command/command-exec.rs b/src/test/ui/command/command-exec.rs
index 0af87214f9523..f24527f57974e 100644
--- a/src/test/ui/command/command-exec.rs
+++ b/src/test/ui/command/command-exec.rs
@@ -12,6 +12,7 @@ use std::env;
 use std::os::unix::process::CommandExt;
 use std::process::Command;
 
+#[allow(deprecated, deprecated_in_future)]
 fn main() {
     let mut args = env::args();
     let me = args.next().unwrap();
diff --git a/src/test/ui/process/process-envs.rs b/src/test/ui/process/process-envs.rs
index 8fc99b23fd210..cd5ecfd8c0faf 100644
--- a/src/test/ui/process/process-envs.rs
+++ b/src/test/ui/process/process-envs.rs
@@ -25,6 +25,7 @@ pub fn env_cmd() -> Command {
     cmd
 }
 
+#[allow(deprecated, deprecated_in_future)]
 fn main() {
     // save original environment
     let old_env = env::var_os("RUN_TEST_NEW_ENV");
diff --git a/src/test/ui/process/process-remove-from-env.rs b/src/test/ui/process/process-remove-from-env.rs
index af4e49dfdbb5b..a468bd3bb9259 100644
--- a/src/test/ui/process/process-remove-from-env.rs
+++ b/src/test/ui/process/process-remove-from-env.rs
@@ -24,6 +24,7 @@ pub fn env_cmd() -> Command {
     cmd
 }
 
+#[allow(deprecated, deprecated_in_future)]
 fn main() {
     // save original environment
     let old_env = env::var_os("RUN_TEST_NEW_ENV");
diff --git a/src/test/ui/std-backtrace.rs b/src/test/ui/std-backtrace.rs
index b5e76666af1f8..211f9fbf02f28 100644
--- a/src/test/ui/std-backtrace.rs
+++ b/src/test/ui/std-backtrace.rs
@@ -24,6 +24,7 @@ fn main() {
     }
 }
 
+#[allow(deprecated, deprecated_in_future)]
 fn runtest(me: &str) {
     env::remove_var("RUST_BACKTRACE");
     env::remove_var("RUST_LIB_BACKTRACE");