ICE With Minimal safer_ffi Example: Expected module, found DefId(18:190)

[zicklag]

Code

cargo.toml:

[package]
name = "ice1"
version = "0.1.0"
edition = "2018"

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

lib.rs:

use safer_ffi::prelude::*;

#[ffi_export]
fn init_plugin() {
    println!("Hello world");
}

Meta

rustc --version --verbose:

binary: rustc
commit-hash: 1eaadebb3dee31669c7649b32747381d11614fae
commit-date: 2020-10-21
host: x86_64-unknown-linux-gnu
release: 1.49.0-nightly
LLVM version: 11.0

Error is not present on Rust stable. I also noticed it on an earlier nightly which I do not have a version number for because I just ran rustup update to make sure the issue wasn't fixed on the latest nightly. Whoops. 😜

Error output

   Compiling ice1 v0.1.0 (/home/zicklag/rust/ice1)
thread 'rustc' panicked at 'Expected module, found DefId(18:190)', compiler/rustc_metadata/src/rmeta/decoder.rs:1194:13
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 1.49.0-nightly (1eaadebb3 2020-10-21) 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 `ice1`

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

Backtrace

stack backtrace:
   0: rust_begin_unwind
             at /rustc/1eaadebb3dee31669c7649b32747381d11614fae/library/std/src/panicking.rs:483:5
   1: std::panicking::begin_panic_fmt
             at /rustc/1eaadebb3dee31669c7649b32747381d11614fae/library/std/src/panicking.rs:437:5
   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::macros::<impl rustc_expand::base::ResolverExpand for rustc_resolve::Resolver>::resolve_macro_invocation
   6: rustc_expand::expand::MacroExpander::fully_expand_fragment
   7: rustc_expand::expand::MacroExpander::expand_crate
   8: rustc_session::utils::<impl rustc_session::session::Session>::time
   9: rustc_interface::passes::configure_and_expand_inner
  10: rustc_interface::passes::configure_and_expand::{{closure}}
  11: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new
  12: rustc_interface::queries::Queries::expansion
  13: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  14: rustc_span::with_source_map
  15: rustc_interface::interface::create_compiler_and_run
  16: scoped_tls::ScopedKey<T>::set

[matthiaskrgr]

duplicate of #75982 I guess?

[zicklag]

Looks like it. I'll close this one then. 👍