libsass/data_context_fuzzer: Bad-cast to Sass::PreValue from Sass::Unary_Expression in Sass::SharedImpl<Sass::PreValue>::SharedImpl<Sass::Expression>

Detailed report: https://oss-fuzz.com/testcase?key=5636165890211840 Project: libsass Fuzzer: libFuzzerdatacontextfuzzer Fuzz target binary: datacontextfuzzer Job Type: libfuzzerubsanlibsass Platform Id: linux Crash Type: Bad-cast Crash Address: 0x0000031e1f40 Crash State: Bad-cast to Sass::PreVal...