ICE: -Zast-json ./src/test/ui/issues/issue-43023.rs

[matthiaskrgr]

Code

code from ./src/test/ui/issues/issue-43023.rs

struct S;

impl S {
    #[derive(Debug)] //~ ERROR `derive` may only be applied to structs, enums and unions
    fn f() {
        file!();
    }
}

fn main() {}

Meta

rustc --version --verbose:

rustc 1.49.0-nightly (31ee872db 2020-10-28)
binary: rustc
commit-hash: 31ee872db5aae4750e3da1ca4ed1523c4356947f
commit-date: 2020-10-28
host: x86_64-unknown-linux-gnu
release: 1.49.0-nightly

Error output

rustc ./src/test/ui/issues/issue-43023.rs -Zast-json

error[E0774]: `derive` may only be applied to structs, enums and unions
 --> ./src/test/ui/issues/issue-43023.rs:4:5
  |
4 |     #[derive(Debug)] //~ ERROR `derive` may only be applied to structs, enums and unions
  |     ^^^^^^^^^^^^^^^^

{"module":{"inner":{"lo":0,"hi":161},"unsafety":"No","items":[{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"prelude_import","span":{"lo":0,"hi":0}},"id":3,"args":null}],"tokens":null},"args":"Empty","tokens":null}]},"id":null,"style":"Outer","span":{"lo":0,"hi":0},"tokens":null}],"id":4,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"","span":{"lo":0,"hi":0}},"kind":{"variant":"Use","fields":[{"prefix":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"{{root}}","span":{"lo":0,"hi":0}},"id":5,"args":null},{"ident":{"name":"std","span":{"lo":0,"hi":0}},"id":6,"args":null},{"ident":{"name":"prelude","span":{"lo":0,"hi":0}},"id":7,"args":null},{"ident":{"name":"v1","span":{"lo":0,"hi":0}},"id":8,"args":null}],"tokens":null},"kind":"Glob","span":{"lo":0,"hi":0}}]},"tokens":null},{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"macro_use","span":{"lo":0,"hi":0}},"id":9,"args":null}],"tokens":null},"args":"Empty","tokens":null}]},"id":null,"style":"Outer","span":{"lo":0,"hi":0},"tokens":null}],"id":10,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"std","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":null},{"attrs":[],"id":11,"span":{"lo":0,"hi":9},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"S","span":{"lo":7,"hi":8}},"kind":{"variant":"Struct","fields":[{"variant":"Unit","fields":[12]},{"params":[],"where_clause":{"has_where_token":false,"predicates":[],"span":{"lo":8,"hi":8}},"span":{"lo":8,"hi":8}}]},"tokens":null},{"attrs":[],"id":13,"span":{"lo":11,"hi":146},"vis":{"kind":"Inherited","span":{"lo":11,"hi":11},"tokens":null},"ident":{"name":"","span":{"lo":0,"hi":0}},"kind":{"variant":"Impl","fields":["No","Positive","Final","No",{"params":[],"where_clause":{"has_where_token":false,"predicates":[],"span":{"lo":17,"hi":17}},"span":{"lo":15,"hi":15}},null,{"id":14,"kind":{"variant":"Path","fields":[null,{"span":{"lo":16,"hi":17},"segments":[{"ident":{"name":"S","span":{"lo":16,"hi":17}},"id":15,"args":null}],"tokens":null}]},"span":{"lo":16,"hi":17},"tokens":null},[{"attrs":[],"id":18,"span":{"lo":113,"hi":144},"vis":{"kind":"Inherited","span":{"lo":113,"hi":113},"tokens":null},"ident":{"name":"f","span":{"lo":116,"hi":117}},"kind":{"variant":"Fn","fields":["Final",{"header":{"unsafety":"No","asyncness":"No","constness":"No","ext":"None"},"decl":{"inputs":[],"output":{"variant":"Default","fields":[{"lo":120,"hi":120}]}},"span":{"lo":113,"hi":119}},{"params":[],"where_clause":{"has_where_token":false,"predicates":[],"span":{"lo":119,"hi":119}},"span":{"lo":117,"hi":117}},{"stmts":[{"id":21,"kind":{"variant":"Semi","fields":[{"id":20,"kind":{"variant":"Lit","fields":[{"token":{"kind":"Str","symbol":"./src/test/ui/issues/issue-43023.rs","suffix":null},"kind":{"variant":"Str","fields":["thread 'rustc' panicked at 'Attempted to encode LazyTokenStream', /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/compiler/rustc_ast/src/tokenstream.rs:178:9
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 (31ee872db 2020-10-28) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z ast-json

query stack during panic:
end of query stack
error: aborting due to previous error

For more information about this error, try `rustc --explain E0774`.
./src/test/ui/issues/issue-43023.rs","Cooked"]},"span":{"lo":130,"hi":138}}]},"span":{"lo":130,"hi":138},"attrs":{"0":null},"tokens":null}]},"span":{"lo":130,"hi":138},"tokens":null}],"id":19,"rules":"Default","span":{"lo":120,"hi":144},"tokens":null}]},"tokens":%      

Backtrace

error[E0774]: `derive` may only be applied to structs, enums and unions
 --> ./src/test/ui/issues/issue-43023.rs:4:5
  |
4 |     #[derive(Debug)] //~ ERROR `derive` may only be applied to structs, enums and unions
  |     ^^^^^^^^^^^^^^^^

{"module":{"inner":{"lo":0,"hi":160},"unsafety":"No","items":[{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"prelude_import","span":{"lo":0,"hi":0}},"id":3,"args":null}],"tokens":null},"args":"Empty","tokens":null}]},"id":null,"style":"Outer","span":{"lo":0,"hi":0},"tokens":null}],"id":4,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"","span":{"lo":0,"hi":0}},"kind":{"variant":"Use","fields":[{"prefix":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"{{root}}","span":{"lo":0,"hi":0}},"id":5,"args":null},{"ident":{"name":"std","span":{"lo":0,"hi":0}},"id":6,"args":null},{"ident":{"name":"prelude","span":{"lo":0,"hi":0}},"id":7,"args":null},{"ident":{"name":"v1","span":{"lo":0,"hi":0}},"id":8,"args":null}],"tokens":null},"kind":"Glob","span":{"lo":0,"hi":0}}]},"tokens":null},{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"macro_use","span":{"lo":0,"hi":0}},"id":9,"args":null}],"tokens":null},"args":"Empty","tokens":null}]},"id":null,"style":"Outer","span":{"lo":0,"hi":0},"tokens":null}],"id":10,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"std","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":null},{"attrs":[],"id":11,"span":{"lo":0,"hi":9},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"S","span":{"lo":7,"hi":8}},"kind":{"variant":"Struct","fields":[{"variant":"Unit","fields":[12]},{"params":[],"where_clause":{"has_where_token":false,"predicates":[],"span":{"lo":8,"hi":8}},"span":{"lo":8,"hi":8}}]},"tokens":null},{"attrs":[],"id":13,"span":{"lo":11,"hi":146},"vis":{"kind":"Inherited","span":{"lo":11,"hi":11},"tokens":null},"ident":{"name":"","span":{"lo":0,"hi":0}},"kind":{"variant":"Impl","fields":["No","Positive","Final","No",{"params":[],"where_clause":{"has_where_token":false,"predicates":[],"span":{"lo":17,"hi":17}},"span":{"lo":15,"hi":15}},null,{"id":14,"kind":{"variant":"Path","fields":[null,{"span":{"lo":16,"hi":17},"segments":[{"ident":{"name":"S","span":{"lo":16,"hi":17}},"id":15,"args":null}],"tokens":null}]},"span":{"lo":16,"hi":17},"tokens":null},[{"attrs":[],"id":18,"span":{"lo":113,"hi":144},"vis":{"kind":"Inherited","span":{"lo":113,"hi":113},"tokens":null},"ident":{"name":"f","span":{"lo":116,"hi":117}},"kind":{"variant":"Fn","fields":["Final",{"header":{"unsafety":"No","asyncness":"No","constness":"No","ext":"None"},"decl":{"inputs":[],"output":{"variant":"Default","fields":[{"lo":120,"hi":120}]}},"span":{"lo":113,"hi":119}},{"params":[],"where_clause":{"has_where_token":false,"predicates":[],"span":{"lo":119,"hi":119}},"span":{"lo":117,"hi":117}},{"stmts":[{"id":21,"kind":{"variant":"Semi","fields":[{"id":20,"kind":{"variant":"Lit","fields":[{"token":{"kind":"Str","symbol":"./src/test/ui/issues/issue-43023.rs","suffix":null},"kind":{"variant":"Str","fields":["thread 'rustc' panicked at 'Attempted to encode LazyTokenStream', /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/compiler/rustc_ast/src/tokenstream.rs:178:9
stack backtrace:
   0:     0x7f5637585e10 - std::backtrace_rs::backtrace::libunwind::trace::h448c56741b6011d3
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/../../backtrace/src/backtrace/libunwind.rs:100:5
   1:     0x7f5637585e10 - std::backtrace_rs::backtrace::trace_unsynchronized::h881b9d30a8a89a0c
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f5637585e10 - std::sys_common::backtrace::_print_fmt::h720a2f61f75b9f58
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f5637585e10 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8d62bbfda6d5c836
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7f56375f5d4c - core::fmt::write::h1857a60b204f1b6a
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/fmt/mod.rs:1078:17
   5:     0x7f5637577a72 - std::io::Write::write_fmt::h16a9fe7680ac245c
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/mod.rs:1518:15
   6:     0x7f563758adc5 - std::sys_common::backtrace::_print::h9ba51a6db618de7d
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7f563758adc5 - std::sys_common::backtrace::print::h5f20e41c85e91716
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7f563758adc5 - std::panicking::default_hook::{{closure}}::h8d48653392f3b04c
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:208:50
   9:     0x7f563758aa68 - std::panicking::default_hook::hb3948d1f74b6ff4c
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:227:9
  10:     0x7f5637e53b18 - rustc_driver::report_ice::h1ddbc5609a6e1f37
  11:     0x7f563758b6c6 - std::panicking::rust_panic_with_hook::h55d23fef0ad751bc
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:597:17
  12:     0x7f5638076e24 - std::panicking::begin_panic::{{closure}}::h0de480f775c645f4
  13:     0x7f5638075f0c - std::sys_common::backtrace::__rust_end_short_backtrace::h647b7d938df017c5
  14:     0x7f5638076ddc - std::panicking::begin_panic::h60af106a34b67eb0
  15:     0x7f56380cf739 - <rustc_ast::tokenstream::LazyTokenStreamInner as rustc_serialize::serialize::Encodable<S>>::encode::h9eeb0ce5189b377a
  16:     0x7f5637f93ebe - <rustc_serialize::json::Encoder as rustc_serialize::serialize::Encoder>::emit_struct::h02e25c19ac282a81
  17:     0x7f5637fa5228 - <rustc_serialize::json::Encoder as rustc_serialize::serialize::Encoder>::emit_seq::h28ebadddb8886382
  18:     0x7f5637fb1dcb - <rustc_serialize::json::Encoder as rustc_serialize::serialize::Encoder>::emit_enum::hc857b016c0483460
  19:     0x7f5637f9cfbc - <rustc_serialize::json::Encoder as rustc_serialize::serialize::Encoder>::emit_struct::hb3bd300b7c1e88fd
  20:     0x7f5637fa7d28 - <rustc_serialize::json::Encoder as rustc_serialize::serialize::Encoder>::emit_seq::hfc2e303ab61bf8d1
  21:     0x7f5637fa332f - <rustc_serialize::json::Encoder as rustc_serialize::serialize::Encoder>::emit_struct::hffd2a3f8ace01639
  22:     0x7f5637f93fb5 - <rustc_serialize::json::Encoder as rustc_serialize::serialize::Encoder>::emit_struct::h077d9f5797530b4f
  23:     0x7f5637f9251b - <rustc_serialize::json::AsJson<T> as core::fmt::Display>::fmt::h515c54af385b66e6
  24:     0x7f56375f5d4c - core::fmt::write::h1857a60b204f1b6a
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/fmt/mod.rs:1078:17
  25:     0x7f563757408b - std::io::Write::write_fmt::h247111350ae51583
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/mod.rs:1518:15
  26:     0x7f563757408b - <&std::io::stdio::Stdout as std::io::Write>::write_fmt::h20b1f5dfc7b242f7
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/stdio.rs:655:9
  27:     0x7f56375761b0 - <std::io::stdio::Stdout as std::io::Write>::write_fmt::h77aa710668163fdb
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/stdio.rs:629:9
  28:     0x7f56375761b0 - std::io::stdio::print_to::{{closure}}::h56ba84a248f3da52
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/stdio.rs:1018:28
  29:     0x7f56375761b0 - core::option::Option<T>::unwrap_or_else::hb1cf6ea0a03b0b88
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/option.rs:427:21
  30:     0x7f56375761b0 - std::io::stdio::print_to::hd44bd7beb95e6ca6
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/stdio.rs:999:18
  31:     0x7f56375761b0 - std::io::stdio::_print::h1862611cc749282f
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/stdio.rs:1033:5
  32:     0x7f563809b888 - rustc_interface::passes::configure_and_expand_inner::h88c1cfdc3da51317
  33:     0x7f563805b045 - rustc_interface::passes::configure_and_expand::{{closure}}::hc6faa1f206fffcb7
  34:     0x7f563804808f - rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new::hbbbef01caab98031
  35:     0x7f56380990a6 - rustc_interface::passes::configure_and_expand::h7478162212729b91
  36:     0x7f56380bdf7b - rustc_interface::queries::Queries::expansion::h644d08ebc965a5a0
  37:     0x7f5637e7050f - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h25b522245624a405
  38:     0x7f5637e3408f - rustc_span::with_source_map::h7455fffe3cd153a4
  39:     0x7f5637e6bb51 - scoped_tls::ScopedKey<T>::set::h8ae8151712a551fd
  40:     0x7f5637e76285 - std::sys_common::backtrace::__rust_begin_short_backtrace::h26de371bc27662fc
  41:     0x7f5637dddca8 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h80d1a8eb7971174b
  42:     0x7f563759a6ca - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9e7afb7a0a438236
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/alloc/src/boxed.rs:1312:9
  43:     0x7f563759a6ca - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h70c646c4271337a1
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/alloc/src/boxed.rs:1312:9
  44:     0x7f563759a6ca - std::sys::unix::thread::Thread::new::thread_start::h35d2b8d36f210d02
                               at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys/unix/thread.rs:89:17
  45:     0x7f56374993e9 - start_thread
  46:     0x7f56373b6293 - __GI___clone
  47:                0x0 - <unknown>

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 (31ee872db 2020-10-28) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z ast-json

query stack during panic:
end of query stack
error: aborting due to previous error

For more information about this error, try `rustc --explain E0774`.
./src/test/ui/issues/issue-43023.rs","Cooked"]},"span":{"lo":130,"hi":138}}]},"span":{"lo":130,"hi":138},"attrs":{"0":null},"tokens":null}]},"span":{"lo":130,"hi":138},"tokens":null}],"id":19,"rules":"Default","span":{"lo":120,"hi":144},"tokens":null}]},"tokens":%