panic: `we captured CapturedPlace`

fn test(temp: usize) {
    async |b, b| {temp}
}

RUSTFLAGS="" ~/.rustup/toolchains/master/bin/rust-analyzer highlight < code.rs

thread 'main' (991934) panicked at src/tools/rust-analyzer/crates/hir-ty/src/infer/closure/analysis.rs:1654:9:
we captured CapturedPlace {
    place: Place {
        base_ty: usize,
        base: Upvar {
            closure: Idx::<Expr>(6),
            var_id: Idx::<Binding>(0),
        },
        projections: [],
    },
    info: CaptureInfo {
        sources: [
            CaptureSourceStack(
                [
                    ExprId(
                        Idx::<Expr>(0),
                    ),
                ],
            ),
        ],
        capture_kind: ByValue,
    },
    mutability: Not,
} but it was not used in the child coroutine?
stack backtrace:
   0:     0x7fe50923dd16 - <<std[a6ca0c0c096ad2d4]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[fae3f2c5d9acceca]::fmt::Display>::fmt
   1:     0x7fe50980ec88 - core[fae3f2c5d9acceca]::fmt::write
   2:     0x7fe50925318c - <std[a6ca0c0c096ad2d4]::sys::stdio::unix::Stderr as core[fae3f2c5d9acceca]::io::write::Write>::write_fmt
   3:     0x7fe5092120da - std[a6ca0c0c096ad2d4]::panicking::default_hook::{closure#0}
   4:     0x7fe509230433 - std[a6ca0c0c096ad2d4]::panicking::default_hook
   5:     0x7fe50923089b - std[a6ca0c0c096ad2d4]::panicking::panic_with_hook
   6:     0x7fe509212192 - std[a6ca0c0c096ad2d4]::panicking::panic_handler::{closure#0}
   7:     0x7fe509206679 - std[a6ca0c0c096ad2d4]::sys::backtrace::__rust_end_short_backtrace::<std[a6ca0c0c096ad2d4]::panicking::panic_handler::{closure#0}, !>
   8:     0x7fe509213aed - __rustc[829c20b9ecbc8940]::rust_begin_unwind
   9:     0x7fe505f866fc - core[fae3f2c5d9acceca]::panicking::panic_fmt
  10:     0x56173ab176ee - <hir_ty[7ac3326e862f8f23]::infer::InferenceContext>::analyze_closures_in_expr
  11:     0x56173ab14b5f - <hir_ty[7ac3326e862f8f23]::infer::InferenceContext>::analyze_closures_in_expr
  12:     0x56173abbc27a - hir_ty[7ac3326e862f8f23]::infer::infer_finalize
  13:     0x56173abc605f - hir_ty[7ac3326e862f8f23]::infer::infer_query_with_inspect
  14:     0x56173aab5e34 - <salsa[49de3200ee4334b]::function::IngredientImpl<<hir_ty[7ac3326e862f8f23]::infer::InferenceResult>::for_body::_::for_body__Configuration_>>::execute
  15:     0x56173a880b97 - <salsa[49de3200ee4334b]::attach::Attached>::attach::<dyn hir_ty[7ac3326e862f8f23]::db::HirDatabase, &hir_ty[7ac3326e862f8f23]::infer::InferenceResult, <hir_ty[7ac3326e862f8f23]::infer::InferenceResult>::for_body::for_body_::{closure#0}>
  16:     0x56173a4e044c - <hir[a4cfbecefd43fc5b]::semantics::SemanticsImpl>::get_unsafe_ops
  17:     0x56173ae4ab43 - ide[1334d1aebe5d4db8]::syntax_highlighting::highlight
  18:     0x56173ae846fe - ide[1334d1aebe5d4db8]::syntax_highlighting::html::highlight_as_html_with_config
  19:     0x56173adeb67c - <ide[1334d1aebe5d4db8]::Analysis>::highlight_as_html
  20:     0x56173b839082 - <rust_analyzer[748176c5a26757ef]::cli::flags::Highlight>::run
  21:     0x56173bad8d54 - rust_analyzer[f4c43ad5a8782b3b]::main
  22:     0x56173ba6fed3 - std[a6ca0c0c096ad2d4]::sys::backtrace::__rust_begin_short_backtrace::<fn() -> core[fae3f2c5d9acceca]::result::Result<std[a6ca0c0c096ad2d4]::process::ExitCode, anyhow[cc6cc6f972cedb14]::Error>, core[fae3f2c5d9acceca]::result::Result<std[a6ca0c0c096ad2d4]::process::ExitCode, anyhow[cc6cc6f972cedb14]::Error>>
  23:     0x56173bad1da2 - std[a6ca0c0c096ad2d4]::rt::lang_start::<core[fae3f2c5d9acceca]::result::Result<std[a6ca0c0c096ad2d4]::process::ExitCode, anyhow[cc6cc6f972cedb14]::Error>>::{closure#0}
  24:     0x7fe50aa20c59 - std[a6ca0c0c096ad2d4]::rt::lang_start_internal
  25:     0x56173baf1ea8 - main
  26:     0x7fe504227741 - <unknown>
  27:     0x7fe504227879 - __libc_start_main
  28:     0x56173a3e3f29 - <unknown>
  29:                0x0 - <unknown>

rust-analyzer 1.99.0-nightly (2118366 2026-07-15)

Reproduce the crash with the async-closure example using the rust-analyzer highlight command. Start at src/tools/rust-analyzer/crates/hir-ty/src/infer/closure/analysis.rs:1654 and trace the closure analysis for the duplicated parameter and captured value. Done means highlighting this input completes without the panic.