ICE when using cfg_if and defining a macro with macro_rules twice. #58490
Description
Compiler crash when using cfg_if and defining a macro with macro_rules twice.
I tried this code:
// file lib.rs #[macro_use] extern crate cfg_if; mod test; mod foo; // file foo.rs cfg_if! { if #[cfg(unix)] { #[macro_export] macro_rules! foo { ( $x:expr, $y:expr ) => { ($x + $y) }; } } } #[macro_export] macro_rules! foo { ( $x:expr, $y:expr ) => { ($x + $y) }; } //file test.rs use crate::foo; #[test] fn test_true() { assert_eq!(foo!(1, 2), 3); }In a repo: https://github.com/theypsilon/rust-bug-crash-cfg-if-macro
I expected to see this happen:
error: a macro namedfoohas already been exported
Instead, this happened:
error: internal compiler error: unexpected panic
Meta
rustc --version --verbose:
rustc 1.32.0-beta.1 (eb53c1039 2018-12-05) binary: rustc commit-hash: eb53c1039300a8bc8f8e4b29659ddc80b1e81b68 commit-date: 2018-12-05 host: x86_64-unknown-linux-gnu release: 1.32.0-beta.1 LLVM version: 8.0Backtrace:
Compiling rust-bug v0.1.0 (/mnt/c/Users/Jose/Documents/Workspace/rust-bug) thread 'rustc' panicked at 'src/librustc_resolve/resolve_imports.rs:941: inconsistent resolution for an import', src/librustc/util/bug.rs:47:26 thread 'rustc' panicked at 'src/librustc_resolve/resolve_imports.rs:941: inconsistent resolution for an import', src/librustc/util/bug.rs:47:26 stack backtrace: 0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49 1: std::sys_common::backtrace::_print at src/libstd/sys_common/backtrace.rs:71 2: std::panicking::default_hook::{{closure}} at src/libstd/sys_common/backtrace.rs:59 at src/libstd/panicking.rs:211 3: std::panicking::default_hook at src/libstd/panicking.rs:227 4: rustc::util::common::panic_hook 5: std::panicking::rust_panic_with_hook at src/libstd/panicking.rs:495 6: std::panicking::begin_panic 7: rustc::util::bug::opt_span_bug_fmt::{{closure}} 8: rustc::ty::context::tls::with_opt::{{closure}} 9: rustc::ty::context::tls::with_context_opt 10: rustc::ty::context::tls::with_opt 11: rustc::util::bug::opt_span_bug_fmt 12: rustc::util::bug::span_bug_fmt 13: rustc_resolve::resolve_imports::ImportResolver::finalize_import::{{closure}} 14: rustc_resolve::resolve_imports::ImportResolver::finalize_imports 15: rustc_resolve::Resolver::resolve_crate 16: rustc::util::common::time 17: rustc_driver::driver::phase_2_configure_and_expand 18: rustc_driver::driver::compile_input 19: rustc_driver::run_compiler_with_pool 20: <scoped_tls::ScopedKey<T>>::set 21: rustc_driver::run_compiler 22: rustc_driver::monitor::{{closure}} 23: __rust_maybe_catch_panic at src/libpanic_unwind/lib.rs:102 24: <F as alloc::boxed::FnBox<A>>::call_box 25: std::sys::unix::thread::Thread::new::thread_start at /rustc/eb53c1039300a8bc8f8e4b29659ddc80b1e81b68/src/liballoc/boxed.rs:683 at src/libstd/sys_common/thread.rs:24 at src/libstd/sys/unix/thread.rs:90 26: start_thread 27: __clone query stack during panic: end of query stack 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/blob/master/CONTRIBUTING.md#bug-reports note: rustc 1.32.0-beta.1 (eb53c1039 2018-12-05) running on x86_64-unknown-linux-gnu note: compiler flags: -C debuginfo=2 -C incremental --crate-type lib note: some of the compiler flags provided by cargo are hidden error: Could not compile `rust-bug`. warning: build failed, waiting for other jobs to finish... stack backtrace: 0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49 1: std::sys_common::backtrace::_print at src/libstd/sys_common/backtrace.rs:71 2: std::panicking::default_hook::{{closure}} at src/libstd/sys_common/backtrace.rs:59 at src/libstd/panicking.rs:211 3: std::panicking::default_hook at src/libstd/panicking.rs:227 4: rustc::util::common::panic_hook 5: std::panicking::rust_panic_with_hook at src/libstd/panicking.rs:495 6: std::panicking::begin_panic 7: rustc::util::bug::opt_span_bug_fmt::{{closure}} 8: rustc::ty::context::tls::with_opt::{{closure}} 9: rustc::ty::context::tls::with_context_opt 10: rustc::ty::context::tls::with_opt 11: rustc::util::bug::opt_span_bug_fmt 12: rustc::util::bug::span_bug_fmt 13: rustc_resolve::resolve_imports::ImportResolver::finalize_import::{{closure}} 14: rustc_resolve::resolve_imports::ImportResolver::finalize_imports 15: rustc_resolve::Resolver::resolve_crate 16: rustc::util::common::time 17: rustc_driver::driver::phase_2_configure_and_expand 18: rustc_driver::driver::compile_input 19: rustc_driver::run_compiler_with_pool 20: <scoped_tls::ScopedKey<T>>::set 21: rustc_driver::run_compiler 22: rustc_driver::monitor::{{closure}} 23: __rust_maybe_catch_panic at src/libpanic_unwind/lib.rs:102 24: <F as alloc::boxed::FnBox<A>>::call_box 25: std::sys::unix::thread::Thread::new::thread_start at /rustc/eb53c1039300a8bc8f8e4b29659ddc80b1e81b68/src/liballoc/boxed.rs:683 at src/libstd/sys_common/thread.rs:24 at src/libstd/sys/unix/thread.rs:90 26: start_thread 27: __clone query stack during panic: end of query stack 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/blob/master/CONTRIBUTING.md#bug-reports note: rustc 1.32.0-beta.1 (eb53c1039 2018-12-05) running on x86_64-unknown-linux-gnu note: compiler flags: -C debuginfo=2 -C incremental note: some of the compiler flags provided by cargo are hidden error: Could not compile `rust-bug`. To learn more, run the command again with --verbose.