syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // These types do not have metadata, so having `meta_attrs` is bogus.
context_before:                 if matches!(tail.kind(), ty::Foreign(..)) {
context_after:                     // Conceptually, unsized arguments must be copied around, which requires dynamically