Standard library function "backtrace_rs::backtrace::trace_unsynchronized" does not codegen (closure crash)

error: internal compiler error: compiler/rustc_middle/src/ty/fold.rs:829:17: Trying to collect bound vars with a bound region: DebruijnIndex(0) BoundRegion { var: 0, kind: BrAnon(0) }

related #109

I think this is the same error I see when trying to build std lib after the #233 fix.

Relevant comment:

            ty::ReLateBound(index, _br) if *index == self.binder_index => {
                // If you hit this, you should be using `Binder::bind_with_vars` or `Binder::rebind`
                bug!("Trying to collect bound vars with a bound region: {:?} {:?}", index, _br)
            }

I suspect the skip_binder here is what needs to change:

        let instance = Instance::resolve(
            self.tcx,
            ty::ParamEnv::reveal_all(),
            def_id,
            trait_ref_t.skip_binder().substs,
        )
        .unwrap()
        .unwrap();

A change to skip_binder seems to fix the listed error; but it seems trace_unsynchronized still fails to compile, now with an issue with the FnOnce trait.

Update: on dc073e5 we get further into compilation, but still fail with:

thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', compiler/rustc_codegen_llvm/src/gotoc/statement.rs:292:41

Backtrace

stack backtrace:
   0: rust_begin_unwind
             at ./src/panicking.rs:515:5
   1: core::panicking::panic_fmt
             at /home/ubuntu/rmc/library/core/src/panicking.rs:92:14
   2: core::panicking::panic_bounds_check
             at /home/ubuntu/rmc/library/core/src/panicking.rs:69:5
   3: <usize as core::slice::index::SliceIndex<[T]>>::index
             at /home/ubuntu/rmc/library/core/src/slice/index.rs:184:10
   4: core::slice::index::<impl core::ops::index::Index<I> for [T]>::index
             at /home/ubuntu/rmc/library/core/src/slice/index.rs:15:9
   5: <alloc::vec::Vec<T,A> as core::ops::index::Index<I>>::index
             at /home/ubuntu/rmc/library/alloc/src/vec/mod.rs:2445:9
   6: rustc_codegen_llvm::gotoc::statement::<impl rustc_codegen_llvm::gotoc::metadata::GotocCtx>::codegen_funcall
             at /home/ubuntu/rmc/compiler/rustc_codegen_llvm/src/gotoc/statement.rs:292:41
   7: rustc_codegen_llvm::gotoc::statement::<impl rustc_codegen_llvm::gotoc::metadata::GotocCtx>::codegen_terminator
             at /home/ubuntu/rmc/compiler/rustc_codegen_llvm/src/gotoc/statement.rs:62:17
   8: rustc_codegen_llvm::gotoc::<impl rustc_codegen_llvm::gotoc::metadata::GotocCtx>::codegen_block
             at /home/ubuntu/rmc/compiler/rustc_codegen_llvm/src/gotoc/mod.rs:63:28
   9: rustc_codegen_llvm::gotoc::<impl rustc_codegen_llvm::gotoc::metadata::GotocCtx>::codegen_function::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_codegen_llvm/src/gotoc/mod.rs:145:71
  10: core::iter::traits::iterator::Iterator::for_each::call::{{closure}}
             at /home/ubuntu/rmc/library/core/src/iter/traits/iterator.rs:733:29
  11: core::iter::adapters::map::map_fold::{{closure}}
             at /home/ubuntu/rmc/library/core/src/iter/adapters/map.rs:82:21
  12: <core::iter::adapters::enumerate::Enumerate<I> as core::iter::traits::iterator::Iterator>::fold::enumerate::{{closure}}
             at /home/ubuntu/rmc/library/core/src/iter/adapters/enumerate.rs:104:27
  13: core::iter::traits::iterator::Iterator::fold
             at /home/ubuntu/rmc/library/core/src/iter/traits/iterator.rs:2153:21
  14: <core::iter::adapters::enumerate::Enumerate<I> as core::iter::traits::iterator::Iterator>::fold
             at /home/ubuntu/rmc/library/core/src/iter/adapters/enumerate.rs:110:9
  15: <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
             at /home/ubuntu/rmc/library/core/src/iter/adapters/map.rs:122:9
  16: core::iter::traits::iterator::Iterator::for_each
             at /home/ubuntu/rmc/library/core/src/iter/traits/iterator.rs:736:9
  17: rustc_codegen_llvm::gotoc::<impl rustc_codegen_llvm::gotoc::metadata::GotocCtx>::codegen_function
             at /home/ubuntu/rmc/compiler/rustc_codegen_llvm/src/gotoc/mod.rs:145:13
  18: <rustc_codegen_llvm::gotoc::GotocCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
             at /home/ubuntu/rmc/compiler/rustc_codegen_llvm/src/gotoc/mod.rs:316:47
  19: rustc_interface::passes::start_codegen::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/passes.rs:1060:9
  20: rustc_data_structures::profiling::VerboseTimingGuard::run
             at /home/ubuntu/rmc/compiler/rustc_data_structures/src/profiling.rs:573:9
  21: rustc_session::utils::<impl rustc_session::session::Session>::time
             at /home/ubuntu/rmc/compiler/rustc_session/src/utils.rs:16:9
  22: rustc_interface::passes::start_codegen
             at /home/ubuntu/rmc/compiler/rustc_interface/src/passes.rs:1059:19
  23: rustc_interface::queries::Queries::ongoing_codegen::{{closure}}::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/queries.rs:295:20
  24: rustc_interface::passes::QueryContext::enter::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/passes.rs:799:42
  25: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_middle/src/ty/context.rs:1744:50
  26: rustc_middle::ty::context::tls::set_tlv
             at /home/ubuntu/rmc/compiler/rustc_middle/src/ty/context.rs:1728:9
  27: rustc_middle::ty::context::tls::enter_context
             at /home/ubuntu/rmc/compiler/rustc_middle/src/ty/context.rs:1744:9
  28: rustc_interface::passes::QueryContext::enter
             at /home/ubuntu/rmc/compiler/rustc_interface/src/passes.rs:799:9
  29: rustc_interface::queries::Queries::ongoing_codegen::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/queries.rs:286:13
  30: rustc_interface::queries::Query<T>::compute
             at /home/ubuntu/rmc/compiler/rustc_interface/src/queries.rs:40:28
  31: rustc_interface::queries::Queries::ongoing_codegen
             at /home/ubuntu/rmc/compiler/rustc_interface/src/queries.rs:284:9
  32: rustc_driver::run_compiler::{{closure}}::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_driver/src/lib.rs:414:13
  33: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
             at /home/ubuntu/rmc/compiler/rustc_interface/src/queries.rs:435:19
  34: rustc_driver::run_compiler::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_driver/src/lib.rs:313:22
  35: rustc_interface::interface::create_compiler_and_run::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/interface.rs:208:13
  36: rustc_span::with_source_map
             at /home/ubuntu/rmc/compiler/rustc_span/src/lib.rs:873:5
  37: rustc_interface::interface::create_compiler_and_run
             at /home/ubuntu/rmc/compiler/rustc_interface/src/interface.rs:202:5
  38: rustc_interface::interface::run_compiler::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/interface.rs:224:12
  39: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/util.rs:158:13
  40: scoped_tls::ScopedKey<T>::set
             at /home/ubuntu/.cargo/registry/src/github.life-white.uk-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137:9
  41: rustc_span::with_session_globals
             at /home/ubuntu/rmc/compiler/rustc_span/src/lib.rs:104:5
  42: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/util.rs:156:9
  43: rustc_interface::util::scoped_thread::{{closure}}
             at /home/ubuntu/rmc/compiler/rustc_interface/src/util.rs:131:24
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

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

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.55.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: -Z force-unstable-if-unmarked -Z trim-diagnostic-paths=no -Z codegen-backend=gotoc -C embed-bitcode=no -C debuginfo=2 --crate-type rlib

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack

Minimal case for the same crash; we fail on boxed closure impls.

fn main() {
    // Create a boxed once-callable closure
    let f: Box<dyn FnOnce()> = Box::new(|| {
    });
    // Call it
    f();
}

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Standard library function `"backtrace_rs::backtrace::trace_unsynchronized"` does not codegen (closure crash) #220

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Standard library function "backtrace_rs::backtrace::trace_unsynchronized" does not codegen (closure crash) #220

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Standard library function `"backtrace_rs::backtrace::trace_unsynchronized"` does not codegen (closure crash) #220