syntax_data: {"ast_node_type":"other","tokens":[{"end":28,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:     if !is_writeable(file) {
context_before: pub fn check_file_is_writeable(file: &Path, sess: &Session) {
context_after:         sess.dcx().emit_fatal(FileIsNotWriteable { file });