syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// An assignable memory location like `x`, `x.f`, `foo()[3]`, that
context_before: pub(crate) enum Category {
context_after:     /// sort of thing. Something that could appear on the LHS of an `=`