syntax_data: {"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"}"}]}
source_snippet:         } else if let Some(arg) = s.strip_prefix("llvm-arg=") {
context_before:             Ok(Self::LlvmModuleFlag(flag.to_string().into()))
context_after:             Ok(Self::LlvmArg(arg.to_string().into()))