syntax_data: {"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:     if let Some(dirs) = option_env!("LLVM_SYS_SYSTEM_LIBRARY_DIRS") {
context_before:     // Add the directories provided through the environment variable.
context_after:         system_library_dirs.extend(dirs.split(':').map(|s| s.to_string()));