ICE with const_generic and integration test

[simon-auch]

Searched a bit, but did not find the same issue. When using const_generics and trying to get an integration test (or benchmark) to run, the compiler ICEs.

I tried this code:
src/lib.rs:

#![feature(const_generics)]

pub struct Foo<const D: usize> {
    pub coords: [u8; D],
}

pub fn foo(_: &[Foo<{ 1 }>]) {}

tests/foo.rs:

extern crate rust_ice;

#[test]
fn test_foo() {
    rust_ice::foo(&vec![]);
}

Cargo.toml:

[package]
name = "rust_ice"
version = "0.1.0"
edition = "2018"

Commandline:
CARGO_INCREMENTAL=0 cargo test

I expected to see this happen: It should build and the test should run without any problems.

Instead, this happened: The Compiler crashes with the following error:
error: internal compiler error: src/librustc_metadata/decoder.rs:474: entry: id not found: DefIndex(17) in crate rust_ice with number 15

Meta

rustc --version --verbose:
rustc 1.39.0-nightly (1dd1884 2019-09-22)
binary: rustc
commit-hash: 1dd1884
commit-date: 2019-09-22
host: x86_64-unknown-linux-gnu
release: 1.39.0-nightly
LLVM version: 9.0

Backtrace:

error: internal compiler error: src/librustc_metadata/decoder.rs:474: entry: id not found: DefIndex(17) in crate rust_ice with number 15

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:643:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:76
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:60
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1030
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1412
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:64
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:196
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:210
  10: rustc_driver::report_ice
  11: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:477
  12: std::panicking::begin_panic
  13: rustc_errors::Handler::bug
  14: rustc::util::bug::opt_span_bug_fmt::{{closure}}
  15: rustc::ty::context::tls::with_opt::{{closure}}
  16: rustc::ty::context::tls::with_context_opt
  17: rustc::ty::context::tls::with_opt
  18: rustc::util::bug::opt_span_bug_fmt
  19: rustc::util::bug::bug_fmt
  20: rustc_metadata::cstore_impl::provide_extern::type_of
  21: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::type_of>::compute
  22: rustc::dep_graph::graph::DepGraph::with_task_impl
  23: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  24: rustc::ty::instance::Instance::resolve
  25: rustc::ty::sty::Const::eval
  26: <smallvec::SmallVec<A> as core::iter::traits::collect::FromIterator<<A as smallvec::Array>::Item>>::from_iter
  27: rustc::ty::fold::TypeFoldable::fold_with
  28: <rustc::traits::project::AssocTypeNormalizer as rustc::ty::fold::TypeFolder>::fold_ty
  29: <rustc::traits::project::AssocTypeNormalizer as rustc::ty::fold::TypeFolder>::fold_ty
  30: <rustc::traits::project::AssocTypeNormalizer as rustc::ty::fold::TypeFolder>::fold_ty
  31: <smallvec::SmallVec<A> as core::iter::traits::collect::FromIterator<<A as smallvec::Array>::Item>>::from_iter
  32: rustc::ty::fold::TypeFoldable::fold_with
  33: rustc::traits::project::normalize
  34: rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt>::confirm_builtin_call
  35: rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt>::check_call
  36: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  37: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  38: rustc_typeck::check::FnCtxt::check_stmt
  39: rustc_typeck::check::FnCtxt::check_block_with_expected
  40: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  41: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  42: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_return_expr
  43: rustc_typeck::check::check_fn
  44: rustc::ty::context::GlobalCtxt::enter_local
  45: rustc_typeck::check::typeck_tables_of
  46: rustc::ty::query::__query_compute::typeck_tables_of
  47: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::typeck_tables_of>::compute
  48: rustc::dep_graph::graph::DepGraph::with_task_impl
  49: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  50: rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners
  51: rustc_typeck::check::typeck_item_bodies
  52: rustc::ty::query::__query_compute::typeck_item_bodies
  53: rustc::dep_graph::graph::DepGraph::with_task_impl
  54: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  55: rustc::util::common::time
  56: rustc_typeck::check_crate
  57: rustc_interface::passes::analysis
  58: rustc::ty::query::__query_compute::analysis
  59: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  60: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
  61: rustc_interface::passes::create_global_ctxt::{{closure}}
  62: rustc_interface::interface::run_compiler_in_existing_thread_pool
  63: std::thread::local::LocalKey<T>::with
  64: scoped_tls::ScopedKey<T>::set
  65: syntax::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[varkor]

This is probably #61624.