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bors d24bb7e289 Auto merge of #16517 - davidbarsky:david/fix-panic-in-generation-function, r=Veykril 
internal: fix crash inside `filter_unnecessary_bounds` for a missing generic param

`@Wilfred` reported a crash here shortly after reporting https://github.com/rust-lang/rust-analyzer/issues/16516, which makes us think that the blast radius of ambiguities in Chalk can be larger than expected. This PR tries to be a bit more defensive as a result.

(The 20th frame is the salient frame in the backtrace below.)

<details>
<summary>Backtrace of the crash</summary>

```
request handler panicked: no entry found for key
backtrace:
   0: stdx::panic_context::PanicContext::init::{{closure}}::{{closure}}::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/panic_context.rs:32:43
   1: stdx::panic_context::with_backtrace::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/panic_context.rs:61:32
   2: std:🧵:local::LocalKey<T>::try_with
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/local.rs:270:16
   3: std:🧵:local::LocalKey<T>::with
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/local.rs:246:9
   4: stdx::panic_context::with_backtrace
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/panic_context.rs:61:5
   5: stdx::panic_context::PanicContext::init::{{closure}}::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/panic_context.rs:31:21
   6: stdx::panic_context::with_ctx::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/panic_context.rs:53:20
   7: std:🧵:local::LocalKey<T>::try_with
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/local.rs:270:16
   8: std:🧵:local::LocalKey<T>::with
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/local.rs:246:9
   9: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2021:9
  10: std::panicking::rust_panic_with_hook
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:783:13
  11: std::panicking::begin_panic_handler::{{closure}}
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:657:13
  12: std::sys_common::backtrace::__rust_end_short_backtrace
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:170:18
  13: rust_begin_unwind
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:645:5
  14: core::panicking::panic_fmt
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panicking.rs:72:14
  15: core::panicking::panic_display
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panicking.rs:178:5
  16: core::panicking::panic_str
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panicking.rs:152:5
  17: core::option::expect_failed
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/option.rs:1985:5
  18: core::option::Option<T>::expect
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/option.rs:894:21
  19: <std::collections:#️⃣:map::HashMap<K,V,S> as core::ops::index::Index<&Q>>::index
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/collections/hash/map.rs:1341:23
  20: ide_assists::handlers::generate_function::filter_unnecessary_bounds::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/handlers/generate_function.rs:911:71
  21: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &mut F>::call_once
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:305:13
  22: core::option::Option<T>::map
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/option.rs:1072:29
  23: <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::next
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/iter/adapters/map.rs:103:26
  24: ide_assists::handlers::generate_function::Graph::compute_reachable_nodes
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/handlers/generate_function.rs:1158:20
  25: ide_assists::handlers::generate_function::filter_unnecessary_bounds
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/handlers/generate_function.rs:912:21
  26: ide_assists::handlers::generate_function::fn_generic_params
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/handlers/generate_function.rs:640:5
  27: ide_assists::handlers::generate_function::FunctionBuilder::from_call
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/handlers/generate_function.rs:283:13
  28: ide_assists::handlers::generate_function::gen_fn
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/handlers/generate_function.rs:78:28
  29: ide_assists::handlers::generate_function::generate_function
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/handlers/generate_function.rs:55:5
  30: ide_assists::assists::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/lib.rs:99:9
  31: <core::slice::iter::Iter<T> as core::iter::traits::iterator::Iterator>::for_each
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/slice/iter/macros.rs:254:21
  32: ide_assists::assists
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide-assists/src/lib.rs:98:5
  33: ide::Analysis::assists_with_fixes::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide/src/lib.rs:667:27
  34: ide::Analysis::with_db::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide/src/lib.rs:764:29
  35: std::panicking::try::do_call
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
  36: std::panicking::try
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
  37: std::panic::catch_unwind
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
  38: salsa::Cancelled::catch
             at /var/twsvcscm/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rust-analyzer-salsa-0.17.0-pre.5/src/lib.rs:631:15
  39: ide::Analysis::with_db
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide/src/lib.rs:764:9
  40: ide::Analysis::assists_with_fixes
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/ide/src/lib.rs:656:9
  41: rust_analyzer::handlers::request::handle_code_action
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/rust-analyzer/src/handlers/request.rs:1149:19
  42: rust_analyzer::dispatch::RequestDispatcher::on_with_thread_intent::{{closure}}::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/rust-analyzer/src/dispatch.rs:198:54
  43: std::panicking::try::do_call
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
  44: std::panicking::try
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
  45: std::panic::catch_unwind
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
  46: rust_analyzer::dispatch::RequestDispatcher::on_with_thread_intent::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/rust-analyzer/src/dispatch.rs:198:26
  47: rust_analyzer::task_pool::TaskPool<T>::spawn::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/rust-analyzer/src/task_pool.rs:26:33
  48: stdx:🧵:pool::Pool::spawn::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/thread/pool.rs:82:13
  49: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
  50: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2007:9
  51: stdx:🧵:pool::Pool:🆕:{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/thread/pool.rs:61:29
  52: stdx:🧵:Builder::spawn::{{closure}}
             at /data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/third-party/rust-analyzer/master/crates/stdx/src/thread.rs:66:13
  53: std::sys_common::backtrace::__rust_begin_short_backtrace
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:154:18
  54: std:🧵:Builder::spawn_unchecked_::{{closure}}::{{closure}}
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/mod.rs:529:17
  55: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panic/unwind_safe.rs:272:9
  56: std::panicking::try::do_call
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
  57: std::panicking::try
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
  58: std::panic::catch_unwind
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
  59: std:🧵:Builder::spawn_unchecked_::{{closure}}
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/mod.rs:528:30
  60: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
  61: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2007:9
  62: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2007:9
  63: std::sys::unix:🧵:Thread:🆕:thread_start
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys/unix/thread.rs:108:17
  64: start_thread
  65: clone3
  ```
  </details>
2024-02-09 11:19:28 +00:00
.cargo Use Cargo's [workspace.lints.*] to config clippy 2023-12-29 23:51:32 +09:00
.github Bump paths-filter 2024-02-07 19:24:35 +02:00
.vscode Spelling 2023-04-19 09:45:55 -04:00
assets Automatically change text color in logo based on dark mode 2022-03-06 23:06:53 +11:00
bench_data Spelling 2023-04-19 09:45:55 -04:00
crates internal: fix crash inside filter_unnecessary_bounds for a missing generic param 2024-02-08 20:58:48 -05:00
docs Auto merge of #15863 - davidbarsky:davidbarsky/start-of-monorepo-mode, r=Veykril 2024-02-08 19:36:09 +00:00
editors/code Auto merge of #15863 - davidbarsky:davidbarsky/start-of-monorepo-mode, r=Veykril 2024-02-08 19:36:09 +00:00
lib Merge commit '0113bc9388b480fa42c632f57f4f0f7af5813ec1' into sync-from-ra 2024-02-04 10:37:58 +02:00
xtask Lint debug prints and disallowed types with clippy 2024-02-01 17:57:27 +01:00
.editorconfig add max_line_length to .editorconfig 2024-01-20 17:14:00 +03:00
.git-blame-ignore-revs add prettier format commit to ignored revisions 2022-05-17 18:15:51 +01:00
.gitattributes Fix .gitattributes for test_data 2022-07-24 14:05:35 +02:00
.gitignore internal: add "Shuffle Crate Graph" command 2021-12-07 16:37:19 +01:00
.typos.toml internal: update .typos.tmol 2024-02-02 18:23:11 +08:00
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Cargo.toml Move salsa fork in-tree 2024-02-07 16:29:46 +01:00
clippy.toml Lint debug prints and disallowed types with clippy 2024-02-01 17:57:27 +01:00
LICENSE-APACHE Licenses 2018-01-10 22:47:04 +03:00
LICENSE-MIT Licenses 2018-01-10 22:47:04 +03:00
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README.md

rust-analyzer logo

rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.

Quick Start

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If you want to contribute to rust-analyzer or are just curious about how things work under the hood, check the ./docs/dev folder.

If you want to use rust-analyzer's language server with your editor of choice, check the manual folder. It also contains some tips & tricks to help you be more productive when using rust-analyzer.

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See the corresponding sections of the manual.

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For usage and troubleshooting requests, please use "IDEs and Editors" category of the Rust forum:

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See LICENSE-APACHE and LICENSE-MIT for details.