ICE when using a reference incorrectly in quick_error

[milkey-mouse]

I was using the latest version of quick-error and tried to store a reference without a lifetime annotated in a macro-generated error. This shouldn't (and doesn't) work, but rustc should at least throw an error instead of blowing up, right?

Code sample:

use quick_error::quick_error;

quick_error! {
    pub enum AReferenceInQuickError {
        CrashesRustc(s: &str) {
            display("hello, {}!", s)
        }
    }
}

fn main() {
    let world = "world";
    AReferenceInQuickError::CrashesRustc(world);
}

I expected an error of some sort about lifetimes or macros, but instead, the compiler paniced:

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: DistinctSources(DistinctSources { begin: (Real("src/main.rs"), BytePos(0)), end: (Macros("::quick_error::quick_error"), BytePos(7612215)) })', src/librustc_errors/lib.rs:197:29

Meta

This rustc was compiled on Gentoo from a recent master.

$ rustc --version --verbose
rustc 1.42.0-dev (2cf24ab89 2020-01-21)
binary: rustc
commit-hash: 2cf24ab89123532f0e84995301ee734a88bf4701
commit-date: 2020-01-21
host: x86_64-unknown-linux-gnu
release: 1.42.0-dev
LLVM version: 9.0

Minimal example: https://github.com/milkey-mouse/quick-error-ice
Backtrace: https://github.com/milkey-mouse/quick-error-ice/blob/master/backtrace

[csmoe]

#68267 cc @estebank

[Centril]

Backtrace:

   Compiling quick-error-ice v0.1.0 (/home/milkey/github/quick-error-ice)
thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: DistinctSources(DistinctSources { begin: (Real("src/main.rs"), BytePos(0)), end: (Macros("::quick_error::quick_error"), BytePos(7612215)) })', src/librustc_errors/lib.rs:197:29
stack backtrace:
   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
   1: core::fmt::write
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: rustc_driver::report_ice
   6: std::panicking::rust_panic_with_hook
   7: rust_begin_unwind
   8: core::panicking::panic_fmt
   9: core::result::unwrap_failed
  10: <unknown>
  11: <unknown>
  12: <rustc_errors::emitter::EmitterWriter as rustc_errors::emitter::Emitter>::emit_diagnostic
  13: <rustc_errors::json::JsonEmitter as rustc_errors::emitter::Emitter>::emit_diagnostic
  14: rustc_errors::HandlerInner::emit_diagnostic
  15: rustc_errors::diagnostic_builder::DiagnosticBuilder::emit
  16: <unknown>
  17: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_lifetime
  18: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_ty
  19: <unknown>
  20: <unknown>
  21: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_item
  22: <unknown>
  23: <unknown>
  24: <unknown>
  25: <unknown>
  26: <unknown>
  27: <unknown>
  28: <unknown>
  29: rustc::ty::context::TyCtxt::object_lifetime_defaults
  30: <unknown>
  31: <unknown>
  32: <unknown>
  33: <unknown>
  34: <unknown>
  35: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
  36: <unknown>
  37: <unknown>
  38: <unknown>
  39: <unknown>
  40: <unknown>
  41: <unknown>
  42: <unknown>
  43: rustc_typeck::check_crate
  44: <unknown>
  45: <unknown>
  46: <unknown>
  47: <unknown>
  48: <unknown>
  49: <unknown>
  50: <unknown>
  51: <unknown>
  52: <unknown>
  53: __rust_maybe_catch_panic
  54: <unknown>
  55: <unknown>
  56: <unknown>
  57: <unknown>
  58: start_thread
  59: __clone
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/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.42.0-dev (2cf24ab89 2020-01-21) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

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

query stack during panic:
#0 [resolve_lifetimes] resolving lifetimes
#1 [object_lifetime_defaults_map] looking up lifetime defaults for a region
#2 [generics_of] processing `main`
#3 [collect_mod_item_types] collecting item types in top-level module
#4 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `quick-error-ice`.

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

[pnkfelix]

triage: P-high, assigning to @estebank . (It would be good to confirm it is indeed due to the CC'ed PR via bisection...)

[estebank]

Full backtrace:

   Compiling no_main v0.1.0 (/Users/ekuber/workspace/asdf)
thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: DistinctSources(DistinctSources { begin: (Real("src/main.rs"), BytePos(0)), end: (Macros("::quick_error::quick_error"), BytePos(7657333)) })', src/librustc_errors/lib.rs:197:29
stack backtrace:
   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
   1: core::fmt::write
   2: std::io::Write::write_fmt
   3: std::sys_common::backtrace::print
   4: std::panicking::default_hook::{{closure}}
   5: std::panicking::default_hook
   6: rustc_driver::report_ice
   7: std::panicking::rust_panic_with_hook
   8: rust_begin_unwind
   9: core::panicking::panic_fmt
  10: core::result::unwrap_failed
  11: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &mut F>::call_once
  12: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter
  13: rustc_errors::CodeSuggestion::splice_lines
  14: <rustc_errors::emitter::EmitterWriter as rustc_errors::emitter::Emitter>::emit_diagnostic
  15: <rustc_errors::json::JsonEmitter as rustc_errors::emitter::Emitter>::emit_diagnostic
  16: rustc_errors::HandlerInner::emit_diagnostic
  17: rustc_errors::Handler::emit_diagnostic
  18: rustc_errors::diagnostic_builder::DiagnosticBuilder::emit
  19: rustc_resolve::lifetimes::LifetimeContext::resolve_elided_lifetimes
  20: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_lifetime
  21: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_ty
  22: rustc_hir::intravisit::walk_struct_def
  23: rustc_hir::intravisit::walk_variant
  24: rustc_hir::intravisit::walk_item
  25: rustc_resolve::lifetimes::LifetimeContext::with
  26: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_item
  27: rustc_resolve::lifetimes::resolve_lifetimes
  28: rustc::ty::query::__query_compute::resolve_lifetimes
  29: rustc::dep_graph::graph::DepGraph::with_task_impl
  30: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  31: core::ops::function::FnOnce::call_once
  32: rustc::dep_graph::graph::DepGraph::with_task_impl
  33: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  34: rustc::ty::context::TyCtxt::object_lifetime_defaults
  35: rustc_typeck::collect::generics_of
  36: rustc::ty::query::__query_compute::generics_of
  37: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::generics_of>::compute
  38: rustc::dep_graph::graph::DepGraph::with_task_impl
  39: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  40: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
  41: rustc::hir::map::Map::visit_item_likes_in_module
  42: rustc_typeck::collect::collect_mod_item_types
  43: rustc::ty::query::__query_compute::collect_mod_item_types
  44: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::collect_mod_item_types>::compute
  45: rustc::dep_graph::graph::DepGraph::with_task_impl
  46: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  47: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::ensure_query
  48: rustc_session::session::Session::track_errors
  49: rustc_typeck::check_crate
  50: rustc_interface::passes::analysis
  51: rustc::ty::query::__query_compute::analysis
  52: rustc::dep_graph::graph::DepGraph::with_eval_always_task
  53: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  54: rustc::ty::context::tls::enter_global
  55: rustc_interface::interface::run_compiler_in_existing_thread_pool
  56: scoped_tls::ScopedKey<T>::set
  57: syntax::with_globals

From a quick look it seems like #68256 might tackle this. Rebuilding a recent master to confirm.