syntax_data: {"ast_node_type":"struct","tokens":[{"end":80,"kind":"keyword","start":0,"text":"traversing"}]}
source_snippet: traversing the HIR of the struct and calling `params_in_repr(Bar)`. But we can't
context_before: the `Foo` in the *second* field of the struct is culpable. This requires
context_after: call params_in_repr for a given type unless it is known to be representable.