syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // coinductive, but GCE is on the way out anyways, so this should eventually
context_before:                 // FIXME(generic_const_exprs): GCE needs well-formedness predicates to be
context_after:                 // be replaced with `false`.