syntax_data: {"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut unstable_opts = UnstableOptions::build(early_dcx, matches, &mut target_modifiers);
context_after:     let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(early_dcx, matches);