syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"lto:"}]}
source_snippet:     lto: LtoCli = (LtoCli::Unspecified, parse_lto, [TRACKED],
context_before:     #[rustc_lint_opt_deny_field_access("use `Session::lto` instead of this field")]
context_after:         "perform LLVM link-time optimizations"),