syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // This leaves the local representing the `resume` argument in place,
context_before: fn transform_gen_context<'tcx>(body: &mut Body<'tcx>) {
context_after:     // but turns it into a regular local variable. This is cheaper than