syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"dwarf_version:"}]}
source_snippet:     dwarf_version: Option<u32> = (None, parse_opt_number, [TRACKED],
context_before:     #[rustc_lint_opt_deny_field_access("use `Session::dwarf_version` instead of this field")]
context_after:         "version of DWARF debug information to emit (default: 2 or 4, depending on platform)"),