Merge subtree update for toolchain nightly-2026-08-21

library/Cargo.toml

@@ -85,3 +85,6 @@ rustflags = [
 rustc-std-workspace-core = { path = 'rustc-std-workspace-core' }
 rustc-std-workspace-alloc = { path = 'rustc-std-workspace-alloc' }
 rustc-std-workspace-std = { path = 'rustc-std-workspace-std' }
+
+# See comments in `library/windows-sys/Cargo.toml` for why this is patched
+windows-sys = { path = 'windows-sys' }

library/alloc/Cargo.toml

@@ -16,7 +16,7 @@ bench = false
 
 [dependencies]
 core = { path = "../core", public = true }
-compiler_builtins = { path = "../compiler-builtins/compiler-builtins", features = ["rustc-dep-of-std"] }
+compiler_builtins = { path = "../compiler-builtins/compiler-builtins", features = ["compiler-builtins"] }
 safety = { path = "../contracts/safety" }
 
 [features]