Closed
Description
I tried this code:
macro_rules! breakme {
($config:stmt; $($tokens:literal)*) => {
#[cfg($config)]
$($tokens)*
};
}
fn main() {
macro_rules! unix {
() => {
not(unix)
};
}
breakme!(unix!(); "test");
}
I didn't actually expect it to work ( yet ), but it shouldn't have panicked.
Meta
Build using the Nightly version: 1.44.0-nightly
(2020-03-30 2113659479a82ea69633)
Backtrace
thread 'rustc' panicked at 'non-eager expansion without a parent scope', src/librustc_resolve/macros.rs:223:37
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:78
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1069
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1439
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
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:198
9: std::panicking::default_hook
at src/libstd/panicking.rs:218
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:515
12: rust_begin_unwind
at src/libstd/panicking.rs:419
13: core::panicking::panic_fmt
at src/libcore/panicking.rs:111
14: core::option::expect_failed
at src/libcore/option.rs:1260
15: rustc_resolve::macros::<impl rustc_expand::base::Resolver for rustc_resolve::Resolver>::resolve_macro_invocation
16: rustc_expand::expand::MacroExpander::fully_expand_fragment
17: rustc_expand::expand::MacroExpander::expand_crate
18: rustc_session::utils::<impl rustc_session::session::Session>::time
19: rustc_interface::passes::configure_and_expand_inner
20: rustc_interface::passes::configure_and_expand::{{closure}}
21: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new
22: rustc_interface::passes::configure_and_expand
23: rustc_interface::queries::Queries::expansion
24: rustc_interface::interface::run_compiler_in_existing_thread_pool
25: scoped_tls::ScopedKey<T>::set
26: rustc_ast::attr::with_globals
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Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Category: This is a bug.Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Helping to "clean up" bugs with minimal examples and bisectionsMedium priorityRelevant to the compiler team, which will review and decide on the PR/issue.ICE tracked in rust-lang/glacier.