Rollup merge of rust-lang#128202 - compiler-errors:internal-lib-featu…

…res, r=oli-obk

Tell users not to file a bug when using internal library features

Actually fixes rust-lang#97501. I don't think we should suppress the suggestion to add `#![feature(..)]`, though I guess I could be convinced otherwise.

r? `@Nilstrieb` cc `@RalfJung`

Didn't add a test b/c I don't think we test this for lang features either, but I can confirm it does work.

```
warning: the feature `core_intrinsics` is internal to the compiler or standard library
 --> /home/michael/test.rs:1:12
  |
1 | #![feature(core_intrinsics)]
  |            ^^^^^^^^^^^^^^^
  |
  = note: using it is strongly discouraged
  = note: `#[warn(internal_features)]` on by default

thread 'rustc' panicked at compiler/rustc_mir_transform/src/validate.rs:94:25:
broken MIR in Item(DefId(0:6 ~ test[42db]::{impl#0}::add)) (after phase change to runtime-optimized) at bb0[0]:
Cannot perform arithmetic Add on type WrapInt8
stack backtrace:
   0: begin_panic_handler
             at ./library/std/src/panicking.rs:665:5
   1: panic_fmt
             at ./library/core/src/panicking.rs:74:14
   2: fail<alloc::string::String>
             at ./compiler/rustc_mir_transform/src/validate.rs:146:9
   3: run_pass
             at ./compiler/rustc_mir_transform/src/validate.rs:94:13
   4: validate_body
             at ./compiler/rustc_mir_transform/src/pass_manager.rs:193:5
   5: run_passes_inner
             at ./compiler/rustc_mir_transform/src/pass_manager.rs:176:13
   6: rustc_mir_transform::pass_manager::run_passes
             at ./compiler/rustc_mir_transform/src/pass_manager.rs:87:5
   7: run_optimization_passes
             at ./compiler/rustc_mir_transform/src/lib.rs:561:5
   8: inner_optimized_mir
             at ./compiler/rustc_mir_transform/src/lib.rs:667:5
   9: optimized_mir
             at ./compiler/rustc_mir_transform/src/lib.rs:630:21
  10: {closure#0}
             at ./compiler/rustc_query_impl/src/plumbing.rs:285:13
      [... omitted 22 frames ...]
  11: query_get_at<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>>
             at ./compiler/rustc_middle/src/query/plumbing.rs:145:17
  12: instance_mir
  13: collect_items_of_instance
             at ./compiler/rustc_monomorphize/src/collector.rs:1203:16
  14: {closure#0}
             at ./compiler/rustc_monomorphize/src/collector.rs:447:17
  15: maybe_grow<(), rustc_monomorphize::collector::collect_items_rec::{closure_env#0}>
             at /home/michael/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stacker-0.1.15/src/lib.rs:55:9
  16: ensure_sufficient_stack<(), rustc_monomorphize::collector::collect_items_rec::{closure_env#0}>
             at ./compiler/rustc_data_structures/src/stack.rs:17:5
  17: collect_items_rec
             at ./compiler/rustc_monomorphize/src/collector.rs:446:13
  18: collect_items_rec
             at ./compiler/rustc_monomorphize/src/collector.rs:526:13
  19: {closure#0}
             at ./compiler/rustc_monomorphize/src/collector.rs:1597:17
  20: {closure#0}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>
             at ./compiler/rustc_data_structures/src/sync/parallel.rs:182:34
  21: call_once<(), rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure#0}::{closure#0}::{closure_env#0}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>
             at ./library/core/src/panic/unwind_safe.rs:272:9
  22: do_call<core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure#0}::{closure#0}::{closure_env#0}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>, ()>
             at ./library/std/src/panicking.rs:557:40
  23: try<(), core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure#0}::{closure#0}::{closure_env#0}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>>
             at ./library/std/src/panicking.rs:521:19
  24: run<(), rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure#0}::{closure#1}::{closure_env#0}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>
             at ./compiler/rustc_data_structures/src/sync/parallel.rs:28:9
  25: {closure#1}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>
             at ./compiler/rustc_data_structures/src/sync/parallel.rs:186:21
  26: {closure#0}<rustc_middle::mir::mono::MonoItem, rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure#0}::{closure_env#1}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>
             at ./library/core/src/iter/traits/iterator.rs:815:29
  27: fold<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global, (), core::iter::traits::iterator::Iterator::for_each::call::{closure_env#0}<rustc_middle::mir::mono::MonoItem, rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure#0}::{closure_env#1}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>>
             at ./library/alloc/src/vec/into_iter.rs:317:25
  28: for_each<alloc::vec::into_iter::IntoIter<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure#0}::{closure_env#1}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>
             at ./library/core/src/iter/traits/iterator.rs:818:9
  29: {closure#0}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>
             at ./compiler/rustc_data_structures/src/sync/parallel.rs:185:17
  30: parallel_guard<(), rustc_data_structures::sync::parallel::enabled::par_for_each_in::{closure_env#0}<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>>
             at ./compiler/rustc_data_structures/src/sync/parallel.rs:44:15
  31: par_for_each_in<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem, alloc::alloc::Global>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure_env#0}>
             at ./compiler/rustc_data_structures/src/sync/parallel.rs:178:9
  32: {closure#1}
             at ./compiler/rustc_monomorphize/src/collector.rs:1595:13
  33: run<(), rustc_monomorphize::collector::collect_crate_mono_items::{closure_env#1}>
             at ./compiler/rustc_data_structures/src/profiling.rs:754:9
  34: time<(), rustc_monomorphize::collector::collect_crate_mono_items::{closure_env#1}>
             at ./compiler/rustc_session/src/utils.rs:16:9
  35: collect_crate_mono_items
             at ./compiler/rustc_monomorphize/src/collector.rs:1594:9
  36: collect_and_partition_mono_items
             at ./compiler/rustc_monomorphize/src/partitioning.rs:1124:30
  37: {closure#0}
             at ./compiler/rustc_query_impl/src/plumbing.rs:281:9
      [... omitted 22 frames ...]
  38: query_get_at<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 24]>>>
             at ./compiler/rustc_middle/src/query/plumbing.rs:145:17
  39: collect_and_partition_mono_items
             at ./compiler/rustc_middle/src/query/plumbing.rs:423:31
  40: collect_and_partition_mono_items
             at ./compiler/rustc_middle/src/query/plumbing.rs:414:17
  41: codegen_crate<rustc_codegen_llvm::LlvmCodegenBackend>
             at ./compiler/rustc_codegen_ssa/src/base.rs:596:25
  42: codegen_crate
             at ./compiler/rustc_codegen_llvm/src/lib.rs:361:18
  43: {closure#0}
             at ./compiler/rustc_interface/src/passes.rs:1027:9
  44: run<alloc::boxed::Box<dyn core::any::Any, alloc::alloc::Global>, rustc_interface::passes::start_codegen::{closure_env#0}>
             at ./compiler/rustc_data_structures/src/profiling.rs:754:9
  45: time<alloc::boxed::Box<dyn core::any::Any, alloc::alloc::Global>, rustc_interface::passes::start_codegen::{closure_env#0}>
             at ./compiler/rustc_session/src/utils.rs:16:9
  46: start_codegen
             at ./compiler/rustc_interface/src/passes.rs:1026:19
  47: codegen_and_build_linker
             at ./compiler/rustc_interface/src/queries.rs:128:31
  48: {closure#6}
             at ./compiler/rustc_driver_impl/src/lib.rs:451:25
  49: {closure#1}<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure_env#6}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_middle/src/ty/context.rs:1336:37
  50: {closure#0}<rustc_middle::ty::context::{impl#19}::enter::{closure_env#1}<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure_env#6}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_middle/src/ty/context/tls.rs:82:9
  51: try_with<core::cell::Cell<*const ()>, rustc_middle::ty::context::tls::enter_context::{closure_env#0}<rustc_middle::ty::context::{impl#19}::enter::{closure_env#1}<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure_env#6}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             at ./library/std/src/thread/local.rs:283:12
  52: with<core::cell::Cell<*const ()>, rustc_middle::ty::context::tls::enter_context::{closure_env#0}<rustc_middle::ty::context::{impl#19}::enter::{closure_env#1}<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure_env#6}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             at ./library/std/src/thread/local.rs:260:9
  53: enter_context<rustc_middle::ty::context::{impl#19}::enter::{closure_env#1}<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure_env#6}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_middle/src/ty/context/tls.rs:79:5
  54: enter<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure_env#6}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_middle/src/ty/context.rs:1336:9
  55: <rustc_interface::queries::QueryResult<&rustc_middle::ty::context::GlobalCtxt>>::enter::<core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure#6}>
             at ./compiler/rustc_interface/src/queries.rs:64:9
  56: {closure#1}
             at ./compiler/rustc_driver_impl/src/lib.rs:450:13
  57: enter<rustc_driver_impl::run_compiler::{closure#0}::{closure_env#1}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_interface/src/queries.rs:209:19
  58: {closure#0}
             at ./compiler/rustc_driver_impl/src/lib.rs:388:22
  59: {closure#1}<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure_env#0}>
             at ./compiler/rustc_interface/src/interface.rs:502:27
  60: {closure#0}<rustc_interface::interface::run_compiler::{closure_env#1}<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure_env#0}>, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_interface/src/util.rs:154:13
  61: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure_env#0}>, core::result::Result<(), rustc_span::ErrorGuaranteed>>, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_interface/src/util.rs:106:21
  62: set<rustc_span::SessionGlobals, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure_env#0}>, core::result::Result<(), rustc_span::ErrorGuaranteed>>, core::result::Result<(), rustc_span::ErrorGuaranteed>>, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             at /home/michael/.cargo/registry/src/index.crates.io-6f17d22bba15001f/scoped-tls-1.0.1/src/lib.rs:137:9
  63: create_session_globals_then<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure_env#0}>, core::result::Result<(), rustc_span::ErrorGuaranteed>>, core::result::Result<(), rustc_span::ErrorGuaranteed>>>
             at ./compiler/rustc_span/src/lib.rs:134:5
  64: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure_env#0}>, core::result::Result<(), rustc_span::ErrorGuaranteed>>, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             at ./compiler/rustc_interface/src/util.rs:105:17
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: the compiler unexpectedly panicked. this is a bug.

note: using internal features is not supported and expected to cause internal compiler errors when used incorrectly

note: rustc 1.82.0-dev running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [optimized_mir] optimizing MIR for `<impl at /home/michael/test.rs:9:1: 9:32>::add`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
```

compiler/rustc_expand/src/config.rs

@@ -117,6 +117,12 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute], crate_name: Symbol) -
             // Otherwise, the feature is unknown. Record it as a lib feature.
             // It will be checked later.
             features.set_declared_lib_feature(name, mi.span());
+
+            // Similar to above, detect internal lib features to suppress
+            // the ICE message that asks for a report.
+            if features.internal(name) && ![sym::core, sym::alloc, sym::std].contains(&crate_name) {
+                sess.using_internal_features.store(true, std::sync::atomic::Ordering::Relaxed);
+            }
         }
     }