syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // An equals option, like `--crate-type=rlib`
context_before:             } else if arg.get(a.len()..a.len() + 1) == Some("=") {
context_after:                 arg[a.len() + 1..].to_string()