Remove the unstable rustc-dep-of-std feature (#694)

The feature was initially added for potential use of `getrandom` in
`std`. Unfortunately, the proposal did not get traction, so the feature
is effectively useless. Before reviving this feature we should resolve
#365 at the very least and even with that it's unlikely that `getrandom`
will be used by `std` considering the proposals to properly expose
entropy sources in `std`.

Closes #693

Author: newpavlov

CHANGELOG.md

@@ -12,8 +12,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - `unsupported` opt-in backend [#667]
 
+### Removed
+- Unstable `rustc-dep-of-std` crate feature [#694]
+
 [#667]: https://github.com/rust-random/getrandom/pull/667
 [#688]: https://github.com/rust-random/getrandom/pull/688
+[#694]: https://github.com/rust-random/getrandom/pull/694
 
 ## [0.3.3] - 2025-05-09
 

Cargo.lock

@@ -15,8 +15,6 @@ exclude = [".*"]
 # Implement std::error::Error for getrandom::Error and
 # use std to retrieve OS error descriptions
 std = []
-# Unstable feature to support being a libstd dependency
-rustc-dep-of-std = ["dep:compiler_builtins", "dep:core"]
 
 # Optional backend: wasm_js
 # This flag enables the backend but does not select it. To use the backend, use
@@ -28,10 +26,6 @@ wasm_js = ["dep:wasm-bindgen", "dep:js-sys"]
 [dependencies]
 cfg-if = "1"
 
-# When built as part of libstd
-compiler_builtins = { version = "0.1", optional = true }
-core = { version = "1.0", optional = true, package = "rustc-std-workspace-core" }
-
 # getrandom / linux_android_with_fallback
 [target.'cfg(all(any(target_os = "linux", target_os = "android"), not(any(all(target_os = "linux", target_env = ""), getrandom_backend = "custom", getrandom_backend = "linux_raw", getrandom_backend = "rdrand", getrandom_backend = "rndr"))))'.dependencies]
 libc = { version = "0.2.154", default-features = false }