syntax_data: {"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let force_ffi = env::var_os(&*ENV_FORCE_FFI).is_some();
context_before:     // See https://bitbucket.org/tari/llvm-sys.rs/issues/12/
context_after:     if force_ffi {