std: Stabilize the `env` module

Now that the `std::env` module has had some time to bake this commit marks most
of its APIs as `#[stable]`. Some notable APIs that are **not** stable (and still
use the same `env` feature gate) are:

* `{set,get}_exit_status` - there are still questions about whether this is the
  right interface for setting/getting the exit status of a process.
* `page_size` - this may change location in the future or perhaps name as well.

This also effectively closes #22122 as the variants of `VarError` are
`#[stable]` now. (this is done intentionally)

1 files changed, 0 insertions, 1 deletions

diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index 82c1a4b1195..1e3428c3ff0 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -36,7 +36,6 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(core)]
-#![feature(env)]
 #![feature(int_uint)]
 #![feature(old_io)]
 #![feature(old_path)]