syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let (mut opts, llvm_target, arch) = base("macos", Arch::X86_64h, TargetAbi::Normal);
context_before: pub(crate) fn target() -> Target {
context_after:     opts.max_atomic_width = Some(128);