syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // expressions or `match` guards, possibly nested within a let-chain.
context_before:                 // After desugaring, `let` expressions should only appear inside `if`
context_after:                 // In both cases they are specifically handled by the lowerings of