syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"BackendRepr::Scalar(_),"}]}
source_snippet:                     BackendRepr::Scalar(_),
context_before:                     field1.backend_repr,
context_after:                     "`ScalarPair` first field with bad ABI in {inner:#?}",