syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"Bivariant,"}]}
source_snippet:     Bivariant,     // T<A> <: T<B>            -- e.g., unused type parameter
context_before:     Contravariant, // T<A> <: T<B> iff B <: A -- e.g., function param type
context_after: }