syntax_data: {"ast_node_type":"other","tokens":[{"end":28,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet: pub trait UpcastFrom<I, T> {
context_before: /// A `From`-like trait that takes `TyCtxt` to perform interner-specific transformations.
context_after:     fn upcast_from(from: T, interner: I) -> Self;