syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // We only want to assign an implicit `()` as the return value of the block if the
context_before:             {
context_after:                 // block does not diverge. (Otherwise, we may try to assign a unit to a `!`-type.)