thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: ParseFloatError { kind: Invalid }', crates/proc_macro_srv/src/rustc_server.rs:514:32 stack backtrace:

[0x8f701]

## Output channel: Rust Analyzer Language Server Trace

[Error  - 2:37:27 PM] Request textDocument/codeLens failed.
  Message: Rust Analyzer is still loading...
  Code: -32801 
[Error  - 2:37:27 PM] Request textDocument/documentSymbol failed.
  Message: Rust Analyzer is still loading...
  Code: -32801 
[Error  - 2:37:29 PM] Request textDocument/codeLens failed.
  Message: Rust Analyzer is still loading...
  Code: -32801 
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: ParseFloatError { kind: Invalid }', crates/proc_macro_srv/src/rustc_server.rs:514:32
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:1076
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1537
   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:217
  10: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:526
  11: rust_begin_unwind
             at src/libstd/panicking.rs:437
  12: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  13: core::option::expect_none_failed
             at src/libcore/option.rs:1269
  14: <proc_macro_srv::rustc_server::Rustc as proc_macro_srv::proc_macro::bridge::server::Literal>::f32
  15: <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
  16: <proc_macro_srv::proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call
  17: proc_macro::bridge::closure::Closure<A,R>::call
             at src/libproc_macro/bridge/closure.rs:27
  18: proc_macro::bridge::client::Literal::string::{{closure}}
             at src/libproc_macro/bridge/client.rs:237
  19: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::{{closure}}
             at src/libproc_macro/bridge/client.rs:321
  20: 
proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}}
             at src/libproc_macro/bridge/client.rs:286
  21: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at src/libproc_macro/bridge/scoped_cell.rs:74
  22: proc_macro::bridge::client::BridgeState::with::{{closure}}
             at src/libproc_macro/bridge/client.rs:284
  23: std::thread::local::LocalKey<T>::try_with
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/thread/local.rs:262
  24: std::thread::local::LocalKey<T>::with
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/thread/local.rs:239
  25: proc_macro::bridge::client::BridgeState::with
             at src/libproc_macro/bridge/client.rs:283
  26: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with
             at src/libproc_macro/bridge/client.rs:314
  27: proc_macro::bridge::
client::Literal::string
             at src/libproc_macro/bridge/client.rs:230
  28: proc_macro::Literal::string
             at src/libproc_macro/lib.rs:1034
  29: proc_macro2::imp::Literal::string
             at /home/cheng/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/wrapper.rs:824
  30: proc_macro2::Literal::string
             at /home/cheng/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/src/lib.rs:1133
  31: syn::lit::LitStr::new
             at /home/cheng/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.39/src/lit.rs:133
  32: failure_derive::fail_derive_impl
             at /home/cheng/.cargo/registry/src/github.com-1ecc6299db9ec823/failure_derive-0.1.8/src/lib.rs:50
  33: failure_derive::fail_derive
             at /home/cheng/.cargo/registry/src/github.com-1ecc6299db9ec823/failure_derive-0.1.8/src/lib.rs:37
  34: failure_derive::Fail
             at /home/cheng/.cargo/registry/src/github.com-1ecc6299db9ec823/failure_derive-0.1.8/<::synstructure::macros::decl_derive macros>:16
  35: core::ops::function::FnOnce::call_once
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libcore/ops/function.rs:232
  36: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1
::run::{{closure}}
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:394
  37: proc_macro::bridge::client::run_client::{{closure}}::{{closure}}
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:362
  38: proc_macro::bridge::scoped_cell::ScopedCell<T>::set::{{closure}}
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/scoped_cell.rs:79
  39: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/scoped_cell.rs:74
  40: proc_macro::bridge::scoped_cell::ScopedCell<T>::set
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/scoped_cell.rs:79

  41: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:310
  42: std::thread::local::LocalKey<T>::try_with
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/thread/local.rs:262
  43: std::thread::local::LocalKey<T>::with
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/thread/local.rs:239
  44: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:310
  45: proc_macro::bridge::client::run_client::{{closure}}
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:355
  46: <std::
panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/panic.rs:318
  47: std::panicking::try::do_call
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/panicking.rs:303
  48: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:86
  49: std::panicking::try
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/panicking.rs:281
  50: std::panic::catch_unwind
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libstd/panic.rs:394
  51: proc_macro::bridge::client::run_client
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:354
  52: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:394
  53: proc_macro_srv::proc_macro::bridge::server::run_server
  54: proc_macro_srv::dylib::Expander::expand

  55: proc_macro_srv::cli::run
  56: rust_analyzer::main
  57: std::rt::lang_start::{{closure}}
  58: std::rt::lang_start_internal::{{
closure}}
             at src/libstd/rt.rs:52
  59: std::panicking::try::do_call
             at src/libstd/panicking.rs:348
  60: std::panicking::try
             at src/libstd/panicking.rs:325
  61: std::panic::catch_unwind
             at src/libstd/panic.rs:394
  62: std::rt::lang_start_internal
             at src/libstd/rt.rs:51
  63: main
  64: __libc_start_main
  65: _start

[0x8f701]

rust-analyzer: eb7136f

[0x8f701]

I have the feelings that it happens often while typing ;

use crate::error::Result;
                        |

[lnicola]

Which Rust toolchain are you using?

[0x8f701]

@lnicola nightly

[lnicola]

#5651 / #5773, although the error message seems different.

[0x8f701]

@lnicola it reminds me of #5864, because when this error happens, it shows also something error messages like [SEMICON]....

[lnicola]

Can you try with #5651?

[lnicola]

@GopherJ I think this was fixed, are you still seeing it?

[Cooie]

I have a similar issue with neovim + coc.nvim + coc-rust-analyzer

Neovim is not responding for about 1s every time when I choose/type directly unwrap() or unwrap_err().

FYI:
rust-analyzer: 2020-11-30
neovim: 0.4.4
coc.nvim: 0.0.79
coc-rust-analyzer: 0.18.0
OS: macOS 11.0.1
iTerm2: Build 3.4.2beta3

[bjorn3]

Does the server log show a panic? If not, this is a separate issue.

[Cooie]

No, there is no panic log from the server log.

[flodiebold]

@GopherJ are you still encountering this?

[0x8f701]

@flodiebold indeed I didn't see it anymore, is there any action behind this? if yes I think it can be closed

[flodiebold]

Maybe #5651, but there were also lots of other changes to the proc macro code.