syntax_data: {"ast_node_type":"import","tokens":[{"end":50,"kind":"keyword","start":0,"text":"use"}]}
source_snippet:     use OptionKind::{Flag, FlagMulti, Multi, Opt};
context_before: pub fn rustc_optgroups() -> Vec<RustcOptGroup> {
context_after:     use OptionStability::{Stable, Unstable};