zed-industries/zed · error

{context}

Error message

{context}

What it means

A generic wrapper (WprContext::wpr_context) that converts a windows_core error from a WPR (Windows Performance Recorder) COM call into an anyhow error whose message is the enriched error context: HRESULT code plus IErrorInfo description. It fires whenever the wrapped COM/API call returns Err; the message itself carries the OS-specific failure detail, so the root cause is the underlying Windows API error code.

Source

Thrown at crates/etw_tracing/etw_tracing.rs:391

            {
                let _ = write!(out, "\n  IErrorInfo: {desc}");
            }
        }
    }

    out
}

trait WprContext<T> {
    fn wpr_context(self, source: &impl Interface) -> Result<T>;
}

impl<T> WprContext<T> for windows_core::Result<T> {
    fn wpr_context(self, source: &impl Interface) -> Result<T> {
        self.map_err(|e| {
            let unknown: windows_core::IUnknown = source.cast().expect("cast to IUnknown");
            let context = wpr_error_context(e.code(), &unknown);
            anyhow::anyhow!("{context}")
        })
    }
}

fn create_wpr<T: windows_core::Interface>(clsid: &windows_core::GUID) -> Result<T> {
    unsafe {
        WPRCCreateInstanceUnderInstanceName::<_, T>(
            &BSTR::from(INSTANCE_NAME),
            clsid,
            None,
            CLSCTX_INPROC_SERVER.0,
        )
        .context("WPRCCreateInstance failed")
    }
}

fn build_profile_collection(heap_pid: Option<u32>) -> Result<IProfileCollection> {
    let collection: IProfileCollection = create_wpr(&CProfileCollection)?;

View on GitHub (pinned to f4178619ac)

Solutions

1. Inspect the HRESULT inside the context string to identify the failing WPR API (permission, session state, provider missing)
2. Run elevated / as admin for WPR recording sessions that require it
3. Propagate the error to the caller with additional context naming the WPR operation attempted

When it happens

Trigger: Thrown at crates/etw_tracing/etw_tracing.rs:391 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/4e3c72a6d12278ae. Report an issue: GitHub.