{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"if"}]}
    if let Some(self_param) = func.self_param(ctx.db) {
fn params_display(ctx: &CompletionContext<'_>, detail: &mut String, func: hir::Function) {
        format_to!(detail, "{}", self_param.display(ctx.db, ctx.display_target));