syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                         // in which we ever want to allow this.
context_before:                         // For an unsized type we'd only pass the sized prefix, so there is no universe
context_after:                         assert!(sized, "`PassMode::Direct` for unsized type in ABI: {:#?}", fn_abi);