syntax_data: {"ast_node_type":"function","tokens":[{"end":48,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet: fn get_system_libcpp() -> Option<&'static str> {
context_before: /// Get the library that must be linked for C++, if any.
context_after:     if let Some(libcpp) = option_env!("LLVM_SYS_LIBCPP") {