syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // Everything else is things like noalias, dereferenceable, nonnull, ...
context_before:         // There's only one regular attribute that matters for the call ABI: InReg.
context_after:         // (This also applies to pointee_size, pointee_align.)