hitting unreachable code when opening files

[Emilgardis]

OS: Windows 10.
rustc: nightly-x86_64-pc-windows-gnu rustc 1.47.0-nightly (a7eff79 2020-07-28)

I get repeating unreachable panics when I open a file. This seems to repeat for a while and then suddenly stops.
I have debug info set to 1, verbose output and experimental set to false

I've edited https://github.com/rust-analyzer/rust-analyzer/blob/5af32aeb2b83c7ae8adf3e088bf4f3691aa45eb1/crates/ra_proc_macro_srv/src/proc_macro/bridge/rpc.rs#L105

to link

    t => unreachable!("could not decode with type {}: got {:?} - tags={:?}", stringify!($name), t, stringify!(
        match u8::decode(r, s) {
            $(tag::$variant => {
                $(let $field = DecodeMut::decode(r, s);)*
                $name::$variant $(($field))*
            })*
        }
    )),

Steps to reproduce:

• With VSC open rust-analyzer/rust-analyzer local repo, without any files in editor.
• Browse to crates\rust-analyzer\src\bin\main.rs and open an editor tab.
• It's possible from here to also just restart ra and the panic will trigger again

The following panic repeatedly hits.

thread 'main' panicked at 'internal error: entered unreachable code: could not decode with type TokenStreamBuilder: got 7 - tags="match u8 :: decode(r, s)\n{\n    tag :: drop => { TokenStreamBuilder :: drop } tag :: new =>\n    { TokenStreamBuilder :: new } tag :: push =>\n    { TokenStreamBuilder :: push } tag :: build =>\n    { TokenStreamBuilder :: build }\n}"', crates\ra_proc_macro_srv\src\proc_macro\bridge\mod.rs:252:5
stack backtrace:
   0: backtrace::backtrace::dbghelp::trace
             at C:\Users\runneradmin\.cargo\registry\src\github.com-1ecc6299db9ec823\backtrace-0.3.46\src\backtrace/dbghelp.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at C:\Users\runneradmin\.cargo\registry\src\github.com-1ecc6299db9ec823\backtrace-0.3.46\src\backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at library\std\src\sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at library\std\src\sys_common/backtrace.rs:59
   4: core::fmt::write
             at library\core\src\fmt/mod.rs:1117
   5: std::io::Write::write_fmt
             at library\std\src\io/mod.rs:1510
   6: std::sys_common::backtrace::_print
             at library\std\src\sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at library\std\src\sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at library\std\src/panicking.rs:198
   9: std::panicking::default_hook
             at library\std\src/panicking.rs:217
  10: std::panicking::rust_panic_with_hook
             at library\std\src/panicking.rs:526
  11: rust_begin_unwind
             at library\std\src/panicking.rs:437
  12: std::panicking::begin_panic_fmt
             at library\std\src/panicking.rs:391
  13: <ra_proc_macro_srv::proc_macro::bridge::api_tags::Method as ra_proc_macro_srv::proc_macro::bridge::rpc::DecodeMut<S>>::decode
             at crates\ra_proc_macro_srv\src\proc_macro\bridge/rpc.rs:0
  14: <ra_proc_macro_srv::proc_macro::bridge::server::Dispatcher<ra_proc_macro_srv::proc_macro::bridge::server::MarkedTypes<S>> as ra_proc_macro_srv::proc_macro::bridge::server::DispatcherTrait>::dispatch
             at crates\ra_proc_macro_srv\src\proc_macro\bridge/server.rs:102
  15: <ra_proc_macro_srv::proc_macro::bridge::server::SameThread as ra_proc_macro_srv::proc_macro::bridge::server::ExecutionStrategy>::run_bridge_and_client::{{closure}}
             at crates\ra_proc_macro_srv\src\proc_macro\bridge/server.rs:152
  16: <ra_proc_macro_srv::proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call
             at crates\ra_proc_macro_srv\src\proc_macro\bridge/closure.rs:20
  17: units_search
  18: units_search
  19: units_search
  20: units_search
  21: units_search
  22: units_search
  23: units_search
  24: units_search
  25: units_search
  26: units_search
  27: units_search
  28: units_search
  29: units_search
  30: units_search
  31: units_search
  32: units_search
  33: units_search
  34: units_search
  35: units_search
  36: units_search
  37: units_search
  38: units_search
  39: units_search
  40: units_search
  41: units_search
  42: units_search
  43: units_search
  44: <ra_proc_macro_srv::proc_macro::bridge::server::SameThread as ra_proc_macro_srv::proc_macro::bridge::server::ExecutionStrategy>::run_bridge_and_client
             at crates\ra_proc_macro_srv\src\proc_macro\bridge/server.rs:154
  45: ra_proc_macro_srv::proc_macro::bridge::server::run_server
             at crates\ra_proc_macro_srv\src\proc_macro\bridge/server.rs:276
  46: ra_proc_macro_srv::proc_macro::bridge::server::<impl ra_proc_macro_srv::proc_macro::bridge::client::Client<fn(ra_proc_macro_srv::proc_macro::bridge::client::TokenStream) .> ra_proc_macro_srv::proc_macro::bridge::client::TokenStream>>::run
             at crates\ra_proc_macro_srv\src\proc_macro\bridge/server.rs:289
  47: ra_proc_macro_srv::dylib::Expander::expand
             at crates\ra_proc_macro_srv\src/dylib.rs:146
  48: ra_proc_macro_srv::ProcMacroSrv::expand
             at crates\ra_proc_macro_srv\src/lib.rs:39
  49: ra_proc_macro_srv::cli::run
             at crates\ra_proc_macro_srv\src/cli.rs:14
  50: rust_analyzer::main
             at crates\rust-analyzer\src/bin/main.rs:31
  51: std::rt::lang_start::{{closure}}
             at C:\Users\Emil\.rustup\toolchains\nightly-x86_64-pc-windows-gnu\lib/rustlib/src/rust\library\std\src/rt.rs:67
  52: std::rt::lang_start_internal::{{closure}}
             at library\std\src/rt.rs:52
  53: std::panicking::try::do_call
             at library\std\src/panicking.rs:348
  54: std::panicking::try
             at library\std\src/panicking.rs:325
  55: std::panic::catch_unwind
             at library\std\src/panic.rs:394
  56: std::rt::lang_start_internal
             at library\std\src/rt.rs:51
  57: main
  58: __tmainCRTStartup
             at D:/mingwbuild/mingw-w64-crt-git/src/mingw-w64/mingw-w64-crt/crt/crtexe.c:337
  59: mainCRTStartup
             at D:/mingwbuild/mingw-w64-crt-git/src/mingw-w64/mingw-w64-crt/crt/crtexe.c:221
  60: units_search
  61: units_search
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

So, seems like something is expecting to get dispatch TokenStreamBuilder with a decode of 7.

Details

INFO [8/1/2020, 11:44:49 AM]: Extension version: 0.4.0-dev
INFO [8/1/2020, 11:44:49 AM]: Using configuration {
  lruCapacity: 30,
  files: { watcher: 'client', exclude: [] },
  notifications: { cargoTomlNotFound: true },
  cargo: {
    autoreload: true,
    noDefaultFeatures: false,
    allFeatures: false,
    features: [],
    loadOutDirsFromCheck: true,
    target: null
  },
  rustfmt: { extraArgs: [], overrideCommand: null },
  checkOnSave: {
    enable: true,
    extraArgs: [],
    command: 'clippy',
    overrideCommand: null,
    allTargets: false,
    noDefaultFeatures: null,
    allFeatures: null,
    features: null
  },
  cargoRunner: null,
  runnableEnv: null,
  inlayHints: {
    enable: true,
    typeHints: true,
    chainingHints: false,
    parameterHints: true,
    maxLength: 20
  },
  completion: {
    addCallParenthesis: true,
    addCallArgumentSnippets: true,
    postfix: { enable: true }
  },
  callInfo: { full: true },
  updates: { channel: 'nightly', askBeforeDownload: true },
  serverPath: 'C:/Users/Emil/.cargo/bin/rust-analyzer.exe',
  trace: { server: 'verbose', extension: true },
  procMacro: { enable: true },
  debug: {
    engine: 'auto',
    sourceFileMap: {
      '/rustc/<id>': '${env:USERPROFILE}/.rustup/toolchains/<toolchain-id>/lib/rustlib/src/rust'
    },
    openDebugPane: false,
    engineSettings: {}
  },
  lens: { enable: true, run: true, debug: true, implementations: true },
  hoverActions: {
    enable: true,
    implementations: true,
    run: true,
    debug: true,
    gotoTypeDef: true
  },
  linkedProjects: null,
  withSysroot: true,
  diagnostics: {
    enable: true,
    enableExperimental: false,
    warningsAsInfo: [],
    warningsAsHint: []
  }
}
INFO [8/1/2020, 11:44:49 AM]: PersistentState: {
  lastCheck: 1592251425728,
  releaseId: 27538406,
  serverVersion: '0.3.187-nightly'
}
INFO [8/1/2020, 11:44:49 AM]: Using server binary at C:/Users/Emil/.cargo/bin/rust-analyzer.exe
DEBUG [8/1/2020, 11:44:49 AM]: Checking availability of a binary at C:/Users/Emil/.cargo/bin/rust-analyzer.exe
DEBUG [8/1/2020, 11:44:49 AM]: C:/Users/Emil/.cargo/bin/rust-analyzer.exe --version: {
  status: 0,
  signal: null,
  output: [ null, 'rust-analyzer 5af32ae\n', '' ],
  pid: 1580,
  stdout: 'rust-analyzer 5af32ae\n',
  stderr: ''
}

[bjorn3]

Nightly recently changed the unstable proc-macro abi. This is likely a symptom of this. For now you can disable proc-macro support in rust-analyzer. (rust-analyzer.procMacros I think)

[whirm]

I'm getting a similar one with today's nightly.
In case it's useful:

STDERR

thread 'main' panicked at 'internal error: entered unreachable code', crates/proc_macro_srv/src/proc_macro/bridge/mod.rs:252:5
stack backtrace:
   0: std::panicking::begin_panic
   1: <proc_macro_srv::proc_macro::bridge::api_tags::Method as proc_macro_srv::proc_macro::bridge::rpc::DecodeMut<S>>::decode
   2: <proc_macro_srv::proc_macro::bridge::server::Dispatcher<proc_macro_srv::proc_macro::bridge::server::MarkedTypes<S>> as proc_macro_srv::proc_macro::bridge::server::DispatcherTrait>::dispatch
   3: <proc_macro_srv::proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call
   4: proc_macro::bridge::closure::Closure<A,R>::call
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/closure.rs:27
   5: proc_macro::bridge::client::TokenStream::into_iter::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:244
   6: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:336
   7: proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:293
   8: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/scoped_cell.rs:74
   9: proc_macro::bridge::client::BridgeState::with::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:291
  10: std::thread::local::LocalKey<T>::try_with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/thread/local.rs:271
  11: std::thread::local::LocalKey<T>::with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/thread/local.rs:247
  12: proc_macro::bridge::client::BridgeState::with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:290
  13: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:329
  14: proc_macro::bridge::client::TokenStream::into_iter
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:237
  15: proc_macro::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro::TokenStream>::into_iter
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/lib.rs:252
  16: <proc_macro2::imp::TokenStream as core::iter::traits::collect::IntoIterator>::into_iter
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/wrapper.rs:280
  17: proc_macro2::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro2::TokenStream>::into_iter
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/lib.rs:1221
  18: syn::buffer::TokenBuffer::inner_new
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/buffer.rs:55
  19: syn::buffer::TokenBuffer::new2
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/buffer.rs:114
  20: <F as syn::parse::Parser>::parse2
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse.rs:1170
  21: syn::parse::Parser::parse
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse.rs:1124
  22: syn::parse_macro_input::parse
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse_macro_input.rs:94
  23: thiserror_impl::derive_error
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/thiserror-impl-1.0.20/src/lib.rs:17
  24: core::ops::function::FnOnce::call_once
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227
  25: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:409
  26: proc_macro::bridge::client::run_client::{{closure}}::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:377
  27: proc_macro::bridge::scoped_cell::ScopedCell<T>::set::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:79
  28: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:74
  29: proc_macro::bridge::scoped_cell::ScopedCell<T>::set
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:79
  30: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:325
  31: std::thread::local::LocalKey<T>::try_with
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:271
  32: std::thread::local::LocalKey<T>::with
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:247
  33: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:325
  34: proc_macro::bridge::client::run_client::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:370
  35: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:308
  36: std::panicking::try::do_call
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:381
  37: __rust_try
  38: std::panicking::try
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:345
  39: std::panic::catch_unwind
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:382
  40: proc_macro::bridge::client::run_client
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:369
  41: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:409
  42: proc_macro_srv::proc_macro::bridge::server::run_server
  43: proc_macro_srv::dylib::Expander::expand
  44: proc_macro_srv::cli::run
  45: rust_analyzer::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
[ERROR rust_analyzer::main_loop] duplicate DidOpenTextDocument: /var/data/projects/playground-projects/substrate/substrate-node-template/lib/ldap/src/tree.rs
[ERROR rust_analyzer::main_loop] duplicate DidOpenTextDocument: /var/data/projects/playground-projects/substrate/substrate-node-template/lib/ldap/src/lib.rs
[ERROR rust_analyzer::main_loop] duplicate DidOpenTextDocument: /var/data/projects/playground-projects/substrate/substrate-node-template/lib/ldap/src/lib.rs
thread 'main' panicked at 'Invalid request
Method: shutdown
 error: invalid type: map, expected unit', /cargo/registry/src/github.com-1ecc6299db9ec823/lsp-server-0.3.4/src/msg.rs:163:17
stack backtrace:
   0: rust_begin_unwind
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panicking.rs:483
   1: std::panicking::begin_panic_fmt
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panicking.rs:437
   2: lsp_server::msg::Request::extract::{{closure}}
   3: lsp_server::msg::Request::extract
   4: rust_analyzer::dispatch::RequestDispatcher::on_sync
   5: rust_analyzer::main_loop::<impl rust_analyzer::global_state::GlobalState>::handle_event
   6: rust_analyzer::main_loop::<impl rust_analyzer::global_state::GlobalState>::run
   7: rust_analyzer::main_loop::main_loop
   8: rust_analyzer::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread 'main' panicked at 'internal error: entered unreachable code', crates/proc_macro_srv/src/proc_macro/bridge/mod.rs:252:5
stack backtrace:
   0: std::panicking::begin_panic
   1: <proc_macro_srv::proc_macro::bridge::api_tags::Method as proc_macro_srv::proc_macro::bridge::rpc::DecodeMut<S>>::decode
   2: <proc_macro_srv::proc_macro::bridge::server::Dispatcher<proc_macro_srv::proc_macro::bridge::server::MarkedTypes<S>> as proc_macro_srv::proc_macro::bridge::server::DispatcherTrait>::dispatch
   3: <proc_macro_srv::proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call
   4: proc_macro::bridge::closure::Closure<A,R>::call
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/closure.rs:27
   5: proc_macro::bridge::client::TokenStream::into_iter::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:244
   6: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:336
   7: proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:293
   8: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/scoped_cell.rs:74
   9: proc_macro::bridge::client::BridgeState::with::{{closure}}
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:291
  10: std::thread::local::LocalKey<T>::try_with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/thread/local.rs:271
  11: std::thread::local::LocalKey<T>::with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/thread/local.rs:247
  12: proc_macro::bridge::client::BridgeState::with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:290
  13: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:329
  14: proc_macro::bridge::client::TokenStream::into_iter
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:237
  15: proc_macro::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro::TokenStream>::into_iter
             at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/lib.rs:252
  16: <proc_macro2::imp::TokenStream as core::iter::traits::collect::IntoIterator>::into_iter
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/wrapper.rs:280
  17: proc_macro2::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro2::TokenStream>::into_iter
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/lib.rs:1221
  18: syn::buffer::TokenBuffer::inner_new
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/buffer.rs:55
  19: syn::buffer::TokenBuffer::new2
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/buffer.rs:114
  20: <F as syn::parse::Parser>::parse2
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse.rs:1170
  21: syn::parse::Parser::parse
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse.rs:1124
  22: syn::parse_macro_input::parse
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse_macro_input.rs:94
  23: thiserror_impl::derive_error
             at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/thiserror-impl-1.0.20/src/lib.rs:17
  24: core::ops::function::FnOnce::call_once
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227
  25: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:409
  26: proc_macro::bridge::client::run_client::{{closure}}::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:377
  27: proc_macro::bridge::scoped_cell::ScopedCell<T>::set::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:79
  28: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:74
  29: proc_macro::bridge::scoped_cell::ScopedCell<T>::set
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:79
  30: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:325
  31: std::thread::local::LocalKey<T>::try_with
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:271
  32: std::thread::local::LocalKey<T>::with
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:247
  33: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:325
  34: proc_macro::bridge::client::run_client::{{closure}}
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:370
  35: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:308
  36: std::panicking::try::do_call
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:381
  37: __rust_try
  38: std::panicking::try
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:345
  39: std::panic::catch_unwind
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:382
  40: proc_macro::bridge::client::run_client
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:369
  41: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run
             at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:409
  42: proc_macro_srv::proc_macro::bridge::server::run_server
  43: proc_macro_srv::dylib::Expander::expand
  44: proc_macro_srv::cli::run
  45: rust_analyzer::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread 'main' panicked at 'internal error: entered unreachable code', crates/proc_macro_srv/src/proc_macro/bridge/mod.rs:252:5
stack backtrace:
   0:     0x55555621d790 - std::backtrace_rs::backtrace::libunwind::trace::h14e81b0c16b543a7
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
   1:     0x55555621d790 - std::backtrace_rs::backtrace::trace_unsynchronized::hc9e39e172835ff32
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/../../backtrace/src/backtrace/mod.rs:66
   2:     0x55555621d790 - std::sys_common::backtrace::_print_fmt::h31994df1c8c77b8f
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/sys_common/backtrace.rs:79
   3:     0x55555621d790 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he74e98acff43ec99
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/sys_common/backtrace.rs:58
   4:     0x555556244dfc - core::fmt::write::h1857a60b204f1b6a
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/core/src/fmt/mod.rs:1080
   5:     0x555556218957 - std::io::Write::write_fmt::hea6289e6649ff508
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/io/mod.rs:1517
   6:     0x55555621fb40 - std::sys_common::backtrace::_print::h8cc65937fea24014
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/sys_common/backtrace.rs:61
   7:     0x55555621fb40 - std::sys_common::backtrace::print::hff6a0ebb96535e34
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/sys_common/backtrace.rs:48
   8:     0x55555621fb40 - std::panicking::default_hook::{{closure}}::h71b9700c5dda1b1d
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panicking.rs:208
   9:     0x55555621f88c - std::panicking::default_hook::h0c46e634c06c69b6
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panicking.rs:227
  10:     0x5555562201a3 - std::panicking::rust_panic_with_hook::he52576a0c2093334
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panicking.rs:577
  11:     0x5555556f01b4 - std::panicking::begin_panic::{{closure}}::h91c884491959fa2e
  12:     0x5555556f014c - std::sys_common::backtrace::__rust_end_short_backtrace::h2d7298cca288fa8a
  13:     0x5555557132cc - std::panicking::begin_panic::h008813ebfa75c32d
  14:     0x5555556d5d8e - <proc_macro_srv::proc_macro::bridge::api_tags::Method as proc_macro_srv::proc_macro::bridge::rpc::DecodeMut<S>>::decode::h2c68b5a659b04f15
  15:     0x5555556e1f9a - <proc_macro_srv::proc_macro::bridge::server::Dispatcher<proc_macro_srv::proc_macro::bridge::server::MarkedTypes<S>> as proc_macro_srv::proc_macro::bridge::server::DispatcherTrait>::dispatch::h0f61f62af72a67b1
  16:     0x5555556d3073 - <proc_macro_srv::proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call::h2e62e23e95537744
  17:     0x7ffff54a799e - proc_macro::bridge::closure::Closure<A,R>::call::hcc3533761e2dbb65
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/closure.rs:27
  18:     0x7ffff54a799e - proc_macro::bridge::client::TokenStream::into_iter::{{closure}}::h6b8d8e373accd292
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:244
  19:     0x7ffff54a799e - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::{{closure}}::h2acf84fa62dd9f4c
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:336
  20:     0x7ffff54a799e - proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}}::h231fef2bd4ab4fbb
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:293
  21:     0x7ffff54a799e - proc_macro::bridge::scoped_cell::ScopedCell<T>::replace::h1defa453477e0a8e
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/scoped_cell.rs:74
  22:     0x7ffff54a799e - proc_macro::bridge::client::BridgeState::with::{{closure}}::h5e66e135a49af667
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:291
  23:     0x7ffff54a799e - std::thread::local::LocalKey<T>::try_with::h287c7989a007b920
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/thread/local.rs:271
  24:     0x7ffff54a799e - std::thread::local::LocalKey<T>::with::hef1305b088ee9d32
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/thread/local.rs:247
  25:     0x7ffff54a799e - proc_macro::bridge::client::BridgeState::with::ha8c0fb9ea948d664
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:290
  26:     0x7ffff54a799e - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::hd3d047ed41803afa
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:329
  27:     0x7ffff54a799e - proc_macro::bridge::client::TokenStream::into_iter::hcb4163f99079a385
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/bridge/client.rs:237
  28:     0x7ffff54a799e - proc_macro::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro::TokenStream>::into_iter::h87e483ef566d3e71
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/proc_macro/src/lib.rs:252
  29:     0x7ffff5479f7c - <proc_macro2::imp::TokenStream as core::iter::traits::collect::IntoIterator>::into_iter::he09cb5e85dd1d13b
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/wrapper.rs:280
  30:     0x7ffff548a109 - proc_macro2::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro2::TokenStream>::into_iter::h50c0ffbcb2c30da5
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/lib.rs:1221
  31:     0x7ffff5412e8b - syn::buffer::TokenBuffer::inner_new::h95581bbf5f276e88
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/buffer.rs:55
  32:     0x7ffff5413acd - syn::buffer::TokenBuffer::new2::h5c0e4a6bef8d5f4e
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/buffer.rs:114
  33:     0x7ffff5258c33 - <F as syn::parse::Parser>::parse2::h01b8aa0a5e3ed1d4
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse.rs:1170
  34:     0x7ffff5258b8a - syn::parse::Parser::parse::hef281ddf40270dc2
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse.rs:1124
  35:     0x7ffff5257258 - syn::parse_macro_input::parse::hb098e8cf868ed6d6
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.36/src/parse_macro_input.rs:94
  36:     0x7ffff526f592 - serde_derive::derive_serialize::hf3fca14f8b24b754
                               at /home/whirm/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.116/src/lib.rs:80
  37:     0x7ffff525b335 - core::ops::function::FnOnce::call_once::h6e0a3463cade47af
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227
  38:     0x7ffff516ba46 - proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run::{{closure}}::h55fde961eb46d6dc
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:409
  39:     0x7ffff516b07f - proc_macro::bridge::client::run_client::{{closure}}::{{closure}}::hbd6846670b43429f
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:377
  40:     0x7ffff5248bf8 - proc_macro::bridge::scoped_cell::ScopedCell<T>::set::{{closure}}::h1bd24fdc8edbf370
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:79
  41:     0x7ffff524941a - proc_macro::bridge::scoped_cell::ScopedCell<T>::replace::h48d88f71114e0437
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:74
  42:     0x7ffff5248bd1 - proc_macro::bridge::scoped_cell::ScopedCell<T>::set::h48bfb5f5a6404a0f
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/scoped_cell.rs:79
  43:     0x7ffff516b8af - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::he1afde07b1e7b42b
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:325
  44:     0x7ffff51f1e3a - std::thread::local::LocalKey<T>::try_with::hdce34893121131d5
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:271
  45:     0x7ffff51f183d - std::thread::local::LocalKey<T>::with::h482dd16665ad2ca7
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:247
  46:     0x7ffff52498cc - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::h2e2877f93dc0200b
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:325
  47:     0x7ffff516aed4 - proc_macro::bridge::client::run_client::{{closure}}::hd6f12000ade46d10
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:370
  48:     0x7ffff5256e12 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hd83f0785fb225cf3
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:308
  49:     0x7ffff516bdc0 - std::panicking::try::do_call::he3a23a3f4ead4cf7
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:381
  50:     0x7ffff51775ad - __rust_try
  51:     0x7ffff516bce0 - std::panicking::try::hf2374814efb91f05
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:345
  52:     0x7ffff5257212 - std::panic::catch_unwind::h38c35dac317a5217
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:382
  53:     0x7ffff516adbb - proc_macro::bridge::client::run_client::hd58d1588dd105646
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:369
  54:     0x7ffff516ba01 - proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run::h45c10b60c87a3d25
                               at /home/whirm/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:409
  55:     0x5555556e1b0a - proc_macro_srv::proc_macro::bridge::server::run_server::h14448ded993b6b2f
  56:     0x555555719c89 - proc_macro_srv::dylib::Expander::expand::h97b8b1dee27f404b
  57:     0x5555556d430e - proc_macro_srv::cli::run::hd25a4b7913f8ce77
  58:     0x5555556bc401 - rust_analyzer::main::hec5d8824a7f27e4f
  59:     0x5555556b6a43 - std::sys_common::backtrace::__rust_begin_short_backtrace::hb3ac26b749a0274b
  60:     0x5555556cd0b9 - std::rt::lang_start::{{closure}}::h1fc83e348e559f5c
  61:     0x555556220671 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h009d20b8a620bf60
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/core/src/ops/function.rs:259
  62:     0x555556220671 - std::panicking::try::do_call::h09431c39e2107c90
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panicking.rs:381
  63:     0x555556220671 - std::panicking::try::he27cf60b958af343
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panicking.rs:345
  64:     0x555556220671 - std::panic::catch_unwind::h7b646b0041dc5591
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/panic.rs:382
  65:     0x555556220671 - std::rt::lang_start_internal::hdad6c98af1e4747e
                               at /rustc/7402a394471a6738a40fea7d4f1891666e5a80c5/library/std/src/rt.rs:51
  66:     0x5555556be982 - main
  67:     0x7ffff7d94cca - __libc_start_main
  68:     0x55555568a659 - <unknown>
thread panicked while panicking. aborting.

Process rust-analyzer stderr finished

Thanks for this awesome project and let me know if I can provide any aditional info!

[lnicola]

@whirm can you try #5651?

[whirm]

@whirm can you try #5651?

on it

[whirm]

@whirm can you try #5651?

It spent some time consuming 100% of one core for a while (not sure how long as I went for lunch after a few minutes).

After that, it doesn't seem to crash anymore.

I'll keep running this version and update this issue if I find any errors.

Thanks @lnicola!

[whirm]

@whirm can you try #5651?

FYI I've been using your branch since and no crashes happened.