syntax_data: {"ast_node_type":"import","tokens":[{"end":91,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // That elevates any type difference to an ABI difference since we just use the
context_before:             // `fn_arg_sanity_check` accepts `PassMode::Direct` for some aggregates.
context_after:             // full Rust type as the LLVM argument/return type.