Tracking issue for experimental features in 1.49 implemented in gccrs

[MajoraSans]

In Rust for Linux :

Required :

• arbitrary_self_types (Tracking issue for RFC 3519: arbitrary_self_types rust-lang/rust#44874)
• doc_cfg (Tracking issue for #[doc(cfg(…))], #[doc(cfg_hide(…))] and doc_auto_cfg rust-lang/rust#43781)
• impl_trait_in_assoc_type (Tracking issue for RFC 2515, "Permit impl Trait in type aliases" rust-lang/rust#63063)
• register_tool (Tracking issue for #![register_tool] rust-lang/rust#66079)

Nice to have :

• associated_type_defaults (Tracking issue for RFC 2532, "Associated type defaults" rust-lang/rust#29661)
• const_trait_impl (Deprecated tracking issue for closed RFC 2632, impl const Trait for Ty and ~const (tilde const) syntax (const_trait_impl) rust-lang/rust#67792)

Done :

• alloc_error_handler (Tracking issue for the #[alloc_error_handler] attribute (for no_std + liballoc) rust-lang/rust#51540)
• inline_const_pat (Tracking Issue for inline const patterns (RFC 2920) rust-lang/rust#76001)

Not in Rust for Linux :

• abi_avr_interrupt (Tracking Issue for the avr-interrupt/avr-non-blocking-interrupt calling convention/ABI rust-lang/rust#69664)
• abi_msp430_interrupt (Tracking issue for the msp430-interrupt calling convention/ABI rust-lang/rust#38487)
• abi_ptx (Tracking issue for the "ptx-kernel" ABI rust-lang/rust#38788)
• abi_x86_interrupt (Tracking issue for the x86-interrupt calling convention rust-lang/rust#40180)
• async_closure (Tracking issue for #![feature(async_closure)] (RFC 2394 / RFC 3668) rust-lang/rust#62290)
• auto_traits (Tracking Issue for auto traits (auto_traits) -- formerly called opt-in built-in traits (optin_builtin_traits) rust-lang/rust#13231)
• box_patterns (Tracking issue for box_patterns feature rust-lang/rust#29641)
• c_variadic (Tracking issue for RFC 2137: Support defining C-compatible variadic functions in Rust  rust-lang/rust#44930)
• cfg_sanitize (Tracking issue for sanitizer support rust-lang/rust#39699)
• cfg_target_thread_local (Tracking issue for thread_local stabilization rust-lang/rust#29594)
• cfg_version (Tracking issue for RFC 2523, #[cfg(version(..))] rust-lang/rust#64796)
• cmse_nonsecure_entry (Tracking Issue for the #[cmse_nonsecure_entry] attribute rust-lang/rust#75835)
• const_extern_fn (Tracking issue for const extern fn and const unsafe extern fn rust-lang/rust#64926)
• const_muts_ref (Tracking issue for &mut T in const contexts (const_mut_refs) rust-lang/rust#57349)
• const_precise_live_drops (Tracking issue for #![feature(const_precise_live_drops)] rust-lang/rust#73255)
• const_refs_to_cell (Tracking Issue for const_refs_to_cell rust-lang/rust#80384)
• const_try (Tracking Issue for the use of ? in constants rust-lang/rust#74935)
• coroutines (Tracking issue for RFC 2033: Experimentally add coroutines to Rust rust-lang/rust#43122)
• custom_inner_attributes (Tracking issue for custom inner attributes rust-lang/rust#54726)
• custom_test_frameworks (Tracking issue for eRFC 2318, Custom test frameworks rust-lang/rust#50297)
• decl_macro (Tracking issue: declarative macros 2.0 rust-lang/rust#39412)
• do_not_recommend (Tracking issue for RFC 2397, "#[do_not_recommend]" rust-lang/rust#51992)
• doc_auto_cfg (Tracking issue for #[doc(cfg(…))], #[doc(cfg_hide(…))] and doc_auto_cfg rust-lang/rust#43781)
• doc_cfg_hide (Tracking issue for #[doc(cfg(…))], #[doc(cfg_hide(…))] and doc_auto_cfg rust-lang/rust#43781)
• doc_masked (Tracking issue for #[doc(masked)] rust-lang/rust#44027)
• doc_notable_trait (Tracking issue for #[doc(spotlight)] rust-lang/rust#45040)
• dropck_eyepatch ((#[may_dangle], a refined dropck escape hatch (tracking issue for RFC 1327) rust-lang/rust#34761)
• exhaustive_patterns (Tracking issue for RFC 1872: exhaustive_patterns feature rust-lang/rust#51085)
• extern_types (Tracking issue for RFC 1861: Extern types rust-lang/rust#43467)
• ffi_const (Tracking issue for #[ffi_const] rust-lang/rust#58328)
• ffi_pure (Tracking issue for #[ffi_const] rust-lang/rust#58328)
• fundamental (Tracking issue for fundamental feature rust-lang/rust#29635)
• generic_const_exprs (Tracking Issue for complex generic constants: feature(generic_const_exprs) rust-lang/rust#76560)
• half_open_range_patterns_in_slices (Tracking issue for ..X, and ..=X (#![feature(half_open_range_patterns)]) rust-lang/rust#67264)
• if_let_guard (Tracking issue for RFC 2294, "if let guard" rust-lang/rust#51114)
• inherent_associated_types (Tracking issue for inherent associated types rust-lang/rust#8995)
• lang_items (https://doc.rust-lang.org/unstable-book/language-features/lang-items.html)
• let_chains (Tracking issue for eRFC 2497, "if- and while-let-chains, take 2" rust-lang/rust#53667)
• link_llvm_intrinsics (Tracking issue for link_llvm_intrinsics rust-lang/rust#29602)
• linkage (Tracking issue for the linkage feature rust-lang/rust#29603)
• marker_trait_attr (Tracking issue for allowing overlapping implementations for marker trait rust-lang/rust#29864)
• min_specialization (Tracking issue for specialization (RFC 1210) rust-lang/rust#31844)
• more_qualified_paths (https://doc.rust-lang.org/unstable-book/language-features/more-qualified-paths.html)
• needs_panic_runtime (Pluggable panic implementations (tracking issue for RFC 1513) rust-lang/rust#32837)
• negative_impls (Tracking issue for negative impls rust-lang/rust#68318)
• never_type (Tracking issue for promoting ! to a type (RFC 1216) rust-lang/rust#35121)
• never_type_fallback (Tracking issue for fallback of diverging expressions to the never_type (!) rust-lang/rust#65992)
• no_core (Tracking issue for internal feature no_core rust-lang/rust#29639)
• no_sanitize (Tracking issue for sanitizer support rust-lang/rust#39699)
• object_safe_for_dispatch (Tracking issue for tweaks to dyn compatibility (RFC 2027) rust-lang/rust#43561)
• optimize_attribute (Tracking issue for RFC 2412, "The optimize attribute" rust-lang/rust#54882)
• panic_runtime (Pluggable panic implementations (tracking issue for RFC 1513) rust-lang/rust#32837)
• postfix_match (https://doc.rust-lang.org/unstable-book/language-features/postfix-match.html)
• proc_macro_hygiene (Tracking issue for procedural macros and "hygiene 2.0" rust-lang/rust#54727)
• profiler_runtime (Tracking issue for -Z profile  rust-lang/rust#42524)
• repr_simd (Tracking issue for SIMD support rust-lang/rust#27731)
• repr128 (Tracking issue for feature(repr128); enums with 128-bit discriminants rust-lang/rust#56071)
• rustc_allow_const_fn_unstable (#[allow_internal_unstable] does not allow unstable library features when applied on functions rust-lang/rust#69399)
• rustc_private (Tracking issue for crates that are compiler dependencies rust-lang/rust#27812)
• simd_ffi (Tracking issue for SIMD support rust-lang/rust#27731)
• specialization (Tracking issue for specialization (RFC 1210) rust-lang/rust#31844)
• start (Tracking issue for the start feature rust-lang/rust#29633)
• stmt_expr_attributes (Tracking issue for stmt_expr_attributes: Add attributes to expressions, etc. rust-lang/rust#15701)
• structural_match (Restrict use of constants in patterns (RFC 1445) rust-lang/rust#31434)
• target_feature_11 (Tracking issue for target_feature 1.1 RFC rust-lang/rust#69098)
• thread_local (Tracking issue for thread_local stabilization rust-lang/rust#29594)
• trait_alias (Tracking issue for trait aliases rust-lang/rust#41517)
• trait_upcasting (Tracking issue for dyn upcasting coercion rust-lang/rust#65991)
• transparent_unions (Tracking issue for RFC 2645, "Transparent Unions" (formerly: and Enums) rust-lang/rust#60405)
• trivial_bounds (Tracking issue for RFC #2056: Allow trivial constraints to appear in where clauses  rust-lang/rust#48214)
• try_blicks (Tracking issue for ? operator and try blocks (RFC 243, question_mark & try_blocks features) rust-lang/rust#31436)
• type_alias_impl_trait (Tracking issue for RFC 2515, "Permit impl Trait in type aliases" rust-lang/rust#63063)
• unboxed_closures (Tracking issue for RFC 2515, "Permit impl Trait in type aliases" rust-lang/rust#63063)
• unnamed_fields (Tracking issue for RFC 2102, "Unnamed fields of struct and union type" rust-lang/rust#49804)
• unsized_fn_params (Tracking issue for RFC #1909: Unsized Rvalues (unsized_locals, unsized_fn_params) rust-lang/rust#48055)
• unsized_locals (Tracking issue for RFC #1909: Unsized Rvalues (unsized_locals, unsized_fn_params) rust-lang/rust#48055)
• unsized_tuple_coercion (Tracking issue for unsized tuple coercion rust-lang/rust#42877)