syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // unsized `self` is passed as a pointer to `self`
context_before:     let wide_pointer_ty = if layout.is_unsized() {
context_after:         // FIXME (mikeyhew) change this to use &own if it is ever added to the language