Match on `Symbol` instead of `&str` for type-checking intrinsics.

src/librustc_span/symbol.rs

@@ -152,10 +152,14 @@
         arm_target_feature,
         asm,
         assert,
+        assert_inhabited,
+        assert_uninit_valid,
+        assert_zero_valid,
         associated_consts,
         associated_type_bounds,
         associated_type_defaults,
         associated_types,
+        assume,
         assume_init,
         async_await,
         async_closure,
@@ -181,11 +185,14 @@
         box_patterns,
         box_syntax,
         braced_empty_structs,
+        breakpoint,
         bswap,
         bitreverse,
         C,
         caller_location,
         cdylib,
+        ceilf32,
+        ceilf64,
         cfg,
         cfg_accessible,
         cfg_attr,
@@ -239,8 +246,14 @@
         convert,
         Copy,
         copy_closures,
+        copy,
+        copy_nonoverlapping,
+        copysignf32,
+        copysignf64,
         core,
         core_intrinsics,
+        cosf32,
+        cosf64,
         count_code_region,
         coverage_counter_add,
         coverage_counter_subtract,
@@ -299,6 +312,7 @@
         dropck_eyepatch,
         dropck_parametricity,
         drop_types_in_const,
+        drop_in_place,
         dylib,
         dyn_trait,
         eh_personality,
@@ -311,11 +325,16 @@
         Eq,
         Equal,
         enclosing_scope,
+        exact_div,
         except,
         exclusive_range_pattern,
         exhaustive_integer_patterns,
         exhaustive_patterns,
         existential_type,
+        expf32,
+        expf64,
+        exp2f32,
+        exp2f64,
         expected,
         export_name,
         expr,
@@ -329,6 +348,10 @@
         f16c_target_feature,
         f32,
         f64,
+        fadd_fast,
+        fabsf32,
+        fabsf64,
+        fdiv_fast,
         feature,
         ffi_const,
         ffi_pure,
@@ -336,13 +359,21 @@
         field,
         field_init_shorthand,
         file,
+        float_to_int_unchecked,
+        floorf64,
+        floorf32,
+        fmaf32,
+        fmaf64,
         fmt,
         fmt_internals,
+        fmul_fast,
         fn_must_use,
         forbid,
+        forget,
         format_args,
         format_args_nl,
         format_args_capture,
+        frem_fast,
         from,
         From,
         from_desugaring,
@@ -352,6 +383,7 @@
         from_ok,
         from_usize,
         from_trait,
+        fsub_fast,
         fundamental,
         future,
         Future,
@@ -448,6 +480,12 @@
         llvm_asm,
         local_inner_macros,
         log_syntax,
+        logf32,
+        logf64,
+        log10f32,
+        log10f64,
+        log2f32,
+        log2f64,
         loop_break_value,
         macro_at_most_once_rep,
         macro_escape,
@@ -475,10 +513,16 @@
         message,
         meta,
         min_align_of,
+        min_align_of_val,
         min_const_fn,
         min_const_unsafe_fn,
         min_specialization,
+        minnumf32,
+        minnumf64,
+        maxnumf32,
+        maxnumf64,
         mips_target_feature,
+        miri_start_panic,
         mmx_target_feature,
         module,
         module_path,
@@ -491,6 +535,8 @@
         naked,
         naked_functions,
         name,
+        nearbyintf32,
+        nearbyintf64,
         needs_allocator,
         needs_drop,
         needs_panic_runtime,
@@ -518,6 +564,7 @@
         None,
         non_exhaustive,
         non_modrs_mods,
+        nontemporal_store,
         nontrapping_fptoint: "nontrapping-fptoint",
         noreturn,
         no_niche,
@@ -577,8 +624,16 @@
         poll,
         Poll,
         powerpc_target_feature,
+        powf32,
+        powf64,
+        powif32,
+        powif64,
         precise_pointer_size_matching,
         pref_align_of,
+        prefetch_read_data,
+        prefetch_read_instruction,
+        prefetch_write_data,
+        prefetch_write_instruction,
         prelude,
         prelude_import,
         preserves_flags,
@@ -640,10 +695,14 @@
         Result,
         Return,
         rhs,
+        rintf32,
+        rintf64,
         riscv_target_feature,
         rlib,
         rotate_left,
         rotate_right,
+        roundf32,
+        roundf64,
         rt,
         rtm_target_feature,
         rust,
@@ -726,14 +785,19 @@
         simd_ffi,
         simd_insert,
         since,
+        sinf32,
+        sinf64,
         size,
         size_of,
+        size_of_val,
         slice_patterns,
         slicing_syntax,
         soft,
         Some,
         specialization,
         speed,
+        sqrtf32,
+        sqrtf64,
         sse4a_target_feature,
         stable,
         staged_api,
@@ -787,6 +851,8 @@
         transparent_enums,
         transparent_unions,
         trivial_bounds,
+        truncf32,
+        truncf64,
         Try,
         try_blocks,
         try_trait,
@@ -809,6 +875,8 @@
         u32,
         u64,
         u8,
+        unaligned_volatile_load,
+        unaligned_volatile_store,
         unboxed_closures,
         unchecked_add,
         unchecked_div,
@@ -824,6 +892,7 @@
         universal_impl_trait,
         unlikely,
         unmarked_api,
+        unreachable,
         unreachable_code,
         unrestricted_attribute_tokens,
         unsafe_block_in_unsafe_fn,
@@ -843,12 +912,21 @@
         val,
         var,
         variant_count,
+        va_arg,
+        va_copy,
+        va_end,
+        va_start,
         vec,
         Vec,
         version,
         vis,
         visible_private_types,
         volatile,
+        volatile_copy_memory,
+        volatile_copy_nonoverlapping_memory,
+        volatile_load,
+        volatile_set_memory,
+        volatile_store,
         warn,
         wasm_import_module,
         wasm_target_feature,
@@ -858,6 +936,7 @@
         wrapping_add,
         wrapping_sub,
         wrapping_mul,
+        write_bytes,
         Yield,
     }
 }

src/librustc_typeck/collect.rs

@@ -2063,7 +2063,7 @@ fn compute_sig_of_foreign_fn_decl<'tcx>(
     ident: Ident,
 ) -> ty::PolyFnSig<'tcx> {
     let unsafety = if abi == abi::Abi::RustIntrinsic {
-        intrinsic_operation_unsafety(&tcx.item_name(def_id).as_str())
+        intrinsic_operation_unsafety(tcx.item_name(def_id))
     } else {
         hir::Unsafety::Unsafe
     };