syntax_data: {"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let os = OsStr::from_bytes(bytes);
context_before:                 let bytes = CStr::from_ptr(fname_ptr).to_bytes();
context_after:                 try_canonicalize(Path::new(os)).map_err(|e| e.to_string())