syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Some((name, val)) = arg.split_once('=') {
context_before:     for arg in matches.opt_strs("env-set") {
context_after:             vars.insert(name.to_string(), val.to_string());