panic when use with samply

[ahabhgk]

Panic: PanicInfo {payload: Any {.. }, message: Some(called 'Result::unwrap()' on an 'Err' value: Error { kind: Unexpec tedEof, message: "failed to fill whole buffer" }), locatcion: Location { file: "/sass-embedded-0.6.2/src/vaarint.rs", line: 8, col: 30 }, can_unwind: true }