Panic context:
> fetch_native_diagnostics

thread 'Worker' panicked at C:\Users\runneradmin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\ra-ap-rustc_pattern_analysis-0.40.0\src\usefulness.rs:954:18:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library\std\src\panicking.rs:645
   1: core::panicking::panic_fmt
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library\core\src\panicking.rs:72
   2: core::panicking::panic_bounds_check
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library\core\src\panicking.rs:208
   3: <smallvec::SmallVec<A> as core::iter::traits::collect::Extend<<A as smallvec::Array>::Item>>::extend
   4: ra_ap_rustc_pattern_analysis::usefulness::collect_pattern_usefulness
   5: ra_ap_rustc_pattern_analysis::usefulness::collect_pattern_usefulness
   6: ra_ap_rustc_pattern_analysis::usefulness::collect_pattern_usefulness
   7: ra_ap_rustc_pattern_analysis::usefulness::compute_match_usefulness
   8: hir_ty::diagnostics::expr::BodyValidationDiagnostic::collect
   9: hir::DefWithBody::diagnostics
  10: hir::ModuleDef::diagnostics
  11: hir::Module::diagnostics
  12: ide_diagnostics::diagnostics
  13: salsa::Cancelled::catch
  14: ide::Analysis::diagnostics
  15: core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut
  16: <alloc::vec::Vec<T> as alloc::vec::spec_from_iter::SpecFromIter<T,I>>::from_iter
  17: core::ops::function::FnOnce::call_once{{vtable.shim}}
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
Panic context:
> 
version: 0.4.1867-standalone (037924c4d 2024-03-03)
request: textDocument/codeAction CodeActionParams {
    text_document: TextDocumentIdentifier {
        uri: Url {
            scheme: "file",
            cannot_be_a_base: false,
            username: "",
            password: None,
            host: None,
            port: None,
            path: "/c%3A/dev/carlos/src/main.rs",
            query: None,
            fragment: None,
        },
    },
    range: Range {
        start: Position {
            line: 1,
            character: 12,
        },
        end: Position {
            line: 1,
            character: 12,
        },
    },
    context: CodeActionContext {
        diagnostics: [
            Diagnostic {
                range: Range {
                    start: Position {
                        line: 1,
                        character: 12,
                    },
                    end: Position {
                        line: 1,
                        character: 13,
                    },
                },
                severity: Some(
                    Warning,
                ),
                code: Some(
                    String(
                        "Click for full compiler diagnostic",
                    ),
                ),
                code_description: Some(
                    CodeDescription {
                        href: Url {
                            scheme: "rust-analyzer-diagnostics-view",
                            cannot_be_a_base: false,
                            username: "",
                            password: None,
                            host: None,
                            port: None,
                            path: "/diagnostic%20message%20%5B2%5D",
                            query: Some(
                                "2",
                            ),
                            fragment: Some(
                                "file%3A%2F%2F%2Fc%253A%2Fdev%2Fcarlos%2Fsrc%2Fmain.rs",
                            ),
                        },
                    },
                ),
                source: Some(
                    "rustc",
                ),
                message: "unused variable: `b`",
                related_information: Some(
                    [
                        DiagnosticRelatedInformation {
                            location: Location {
                                uri: Url {
                                    scheme: "file",
                                    cannot_be_a_base: false,
                                    username: "",
                                    password: None,
                                    host: None,
                                    port: None,
                                    path: "/c%3A/dev/carlos/src/main.rs",
                                    query: None,
                                    fragment: None,
                                },
                                range: Range {
                                    start: Position {
                                        line: 1,
                                        character: 12,
                                    },
                                    end: Position {
                                        line: 1,
                                        character: 13,
                                    },
                                },
                            },
                            message: "if this is intentional, prefix it with an underscore: `_b`",
                        },
                    ],
                ),
                tags: Some(
                    [
                        Unnecessary,
                    ],
                ),
                data: Some(
                    Object {
                        "rendered": String("\u{1b}[0m\u{1b}[1m\u{1b}[38;5;11mwarning\u{1b}[0m\u{1b}[0m\u{1b}[1m\u{1b}[38;5;15m: unused variable: `b`\u{1b}[0m\n\u{1b}[0m \u{1b}[0m\u{1b}[0m\u{1b}[1m\u{1b}[38;5;14m--> \u{1b}[0m\u{1b}[0msrc\\main.rs:2:13\u{1b}[0m\n\u{1b}[0m  \u{1b}[0m\u{1b}[0m\u{1b}[1m\u{1b}[38;5;14m|\u{1b}[0m\n\u{1b}[0m\u{1b}[1m\u{1b}[38;5;14m2\u{1b}[0m\u{1b}[0m \u{1b}[0m\u{1b}[0m\u{1b}[1m\u{1b}[38;5;14m|\u{1b}[0m\u{1b}[0m \u{1b}[0m\u{1b}[0m    let (a, b) = (0, 0);\u{1b}[0m\n\u{1b}[0m  \u{1b}[0m\u{1b}[0m\u{1b}[1m\u{1b}[38;5;14m| \u{1b}[0m\u{1b}[0m            \u{1b}[0m\u{1b}[0m\u{1b}[1m\u{1b}[38;5;11m^\u{1b}[0m\u{1b}[0m \u{1b}[0m\u{1b}[0m\u{1b}[1m\u{1b}[38;5;11mhelp: if this is intentional, prefix it with an underscore: `_b`\u{1b}[0m\n\n"),
                    },
                ),
            },
            Diagnostic {
                range: Range {
                    start: Position {
                        line: 1,
                        character: 12,
                    },
                    end: Position {
                        line: 1,
                        character: 13,
                    },
                },
                severity: Some(
                    Hint,
                ),
                code: Some(
                    String(
                        "unused_variables",
                    ),
                ),
                code_description: None,
                source: Some(
                    "rustc",
                ),
                message: "if this is intentional, prefix it with an underscore: `_b`",
                related_information: Some(
                    [
                        DiagnosticRelatedInformation {
                            location: Location {
                                uri: Url {
                                    scheme: "file",
                                    cannot_be_a_base: false,
                                    username: "",
                                    password: None,
                                    host: None,
                                    port: None,
                                    path: "/c%3A/dev/carlos/src/main.rs",
                                    query: None,
                                    fragment: None,
                                },
                                range: Range {
                                    start: Position {
                                        line: 1,
                                        character: 12,
                                    },
                                    end: Position {
                                        line: 1,
                                        character: 13,
                                    },
                                },
                            },
                            message: "original diagnostic",
                        },
                    ],
                ),
                tags: None,
                data: None,
            },
        ],
        only: None,
        trigger_kind: Some(
            Automatic,
        ),
    },
    work_done_progress_params: WorkDoneProgressParams {
        work_done_token: None,
    },
    partial_result_params: PartialResultParams {
        partial_result_token: None,
    },
}

thread 'Worker' panicked at C:\Users\runneradmin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\ra-ap-rustc_pattern_analysis-0.40.0\src\usefulness.rs:954:18:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library\std\src\panicking.rs:645
   1: core::panicking::panic_fmt
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library\core\src\panicking.rs:72
   2: core::panicking::panic_bounds_check
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library\core\src\panicking.rs:208
   3: <smallvec::SmallVec<A> as core::iter::traits::collect::Extend<<A as smallvec::Array>::Item>>::extend
   4: ra_ap_rustc_pattern_analysis::usefulness::collect_pattern_usefulness
   5: ra_ap_rustc_pattern_analysis::usefulness::collect_pattern_usefulness
   6: ra_ap_rustc_pattern_analysis::usefulness::collect_pattern_usefulness
   7: ra_ap_rustc_pattern_analysis::usefulness::compute_match_usefulness
   8: hir_ty::diagnostics::expr::BodyValidationDiagnostic::collect
   9: hir::DefWithBody::diagnostics
  10: hir::ModuleDef::diagnostics
  11: hir::Module::diagnostics
  12: ide_diagnostics::diagnostics
  13: std::panicking::try
  14: ide::Analysis::assists_with_fixes
  15: rust_analyzer::handlers::request::handle_code_action
  16: std::panicking::try
  17: core::ops::function::FnOnce::call_once{{vtable.shim}}
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.