syntax_data: {"ast_node_type":"import","tokens":[{"end":87,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // or `&/&mut dyn Trait` because this is special-cased elsewhere in codegen
context_before:             // Instead, pass just the data pointer, but give it the type `*const/mut dyn Trait`
context_after:             make_thin_self_ptr(cx, layout)