build(core/rust): disable nightly-only features

When we need them, we will re-enable.

core/embed/rust/Cargo.lock

@@ -60,12 +60,6 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
-[[package]]
-name = "cc"
-version = "1.0.67"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3c69b077ad434294d3ce9f1f6143a2a4b89a8a2d54ef813d85003a4fd1137fd"
-
 [[package]]
 name = "cexpr"
 version = "0.4.0"
@@ -270,12 +264,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42a568c8f2cd051a4d283bd6eb0343ac214c1b0f1ac19f93e1175b2dee38c73d"
 
-[[package]]
-name = "staticvec"
-version = "0.10.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c87f4be0fd89694157f3814ca88715ad8ba6010c453b1e89ca264aee04d70b9"
-
 [[package]]
 name = "strsim"
 version = "0.8.0"
@@ -314,10 +302,8 @@ name = "trezor_lib"
 version = "0.1.0"
 dependencies = [
  "bindgen",
- "cc",
  "cstr_core",
  "cty",
- "staticvec",
 ]
 
 [[package]]

core/embed/rust/Cargo.toml

@@ -22,10 +22,6 @@ codegen-units = 1
 [dependencies]
 cty = "0.2.1"
 
-[dependencies.staticvec]
-version = "0.10.5"
-default_features = false
-
 [dependencies.cstr_core]
 version = "0.2.2"
 default_features = false

core/embed/rust/rust-toolchain

@@ -1,2 +0,0 @@
-nightly
-

core/embed/rust/src/lib.rs

@@ -1,8 +1,4 @@
 #![cfg_attr(not(test), no_std)]
-#![feature(never_type)]
-#![feature(unsize)]
-#![feature(coerce_unsized)]
-#![feature(dispatch_from_dyn)]
 #![deny(clippy::all)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![allow(dead_code)]

core/embed/rust/src/micropython/gc.rs

@@ -1,7 +1,6 @@
 use core::{
     alloc::Layout,
-    marker::Unsize,
-    ops::{CoerceUnsized, Deref, DispatchFromDyn},
+    ops::Deref,
     ptr::{self, NonNull},
 };
 
@@ -13,9 +12,6 @@ use super::ffi;
 /// `Copy` and `Clone`, we avoid doing this until proven necessary.
 pub struct Gc<T: ?Sized>(NonNull<T>);
 
-impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Gc<U>> for Gc<T> {}
-impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Gc<U>> for Gc<T> {}
-
 impl<T> Gc<T> {
     /// Allocate memory on the heap managed by the MicroPython garbage collector
     /// and then place `v` into it. `v` will _not_ get its destructor called.