Panic on safer_ffi's ffi_export

[jacg]

Code

src/lib.rs

use ::safer_ffi::prelude::ffi_export;

#[ffi_export]
pub fn foo() {}

Cargo.toml

[package]
name = "panic"
version = "0.1.0"
authors = ["panic"]
edition = "2018"

[dependencies]
safer-ffi = { version = "0.0.5" }

Meta

rustc --version --verbose:

rustc --version --verbose
rustc 1.47.0 (18bf6b4f0 2020-10-07)
binary: rustc
commit-hash: 18bf6b4f01a6feaf7259ba7cdae58031af1b7b39
commit-date: 2020-10-07
host: x86_64-unknown-linux-gnu
release: 1.47.0
LLVM version: 11.0

The errors shown below were generated by the stable compiler version shown above, but essentially the same error is also generated by the following nightly:

rustc 1.49.0-nightly (a9cd294cf 2020-10-22)
binary: rustc
commit-hash: a9cd294cf2775441e713c7ee2918b728733b99f5
commit-date: 2020-10-22
host: x86_64-unknown-linux-gnu
release: 1.49.0-nightly
LLVM version: 11.0

Error output

   Compiling panic v0.1.0 (/home/jacek/rust/deleteme-ffi)
thread 'rustc' panicked at 'Expected module, found DefId(18:196)', src/librustc_metadata/rmeta/decoder.rs:1178:13
note: run with `RUST_BACKTRACE=1` environment variable to display a 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 1.47.0 (18bf6b4f0 2020-10-07) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type lib

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

error: could not compile `panic`.

To learn more, run the command again with --verbose.

Backtrace

   Compiling panic v0.1.0 (/home/jacek/rust/deleteme-ffi)
thread 'rustc' panicked at 'Expected module, found DefId(18:196)', src/librustc_metadata/rmeta/decoder.rs:1178:13
stack backtrace:
   0: rust_begin_unwind
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:475
   1: std::panicking::begin_panic_fmt
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:429
   2: rustc_metadata::rmeta::decoder::cstore_impl::<impl rustc_metadata::creader::CStore>::module_expansion_untracked
   3: rustc_resolve::build_reduced_graph::<impl rustc_resolve::Resolver>::get_module
   4: rustc_resolve::build_reduced_graph::<impl rustc_resolve::Resolver>::get_module
   5: rustc_resolve::build_reduced_graph::<impl rustc_resolve::Resolver>::macro_def_scope
   6: rustc_resolve::macros::<impl rustc_expand::base::ResolverExpand for rustc_resolve::Resolver>::resolve_macro_invocation
   7: rustc_expand::expand::MacroExpander::fully_expand_fragment
   8: rustc_expand::expand::MacroExpander::expand_crate
   9: rustc_session::utils::<impl rustc_session::session::Session>::time
  10: rustc_interface::passes::configure_and_expand_inner
  11: rustc_interface::passes::configure_and_expand::{{closure}}
  12: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new
  13: rustc_interface::passes::configure_and_expand
  14: rustc_interface::queries::Queries::expansion
  15: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  16: rustc_span::with_source_map
  17: rustc_interface::interface::create_compiler_and_run
  18: scoped_tls::ScopedKey<T>::set
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 1.47.0 (18bf6b4f0 2020-10-07) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type lib

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

query stack during panic:
end of query stack
error: could not compile `panic`.

[jyn514]

Duplicate of #75982