syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// `source_trait_ref`. If successful, returns the generic parameters for *all* the
context_before: /// Attempt to fulfill all obligations of `target_impl` after unification with
context_after: /// generics of `target_impl`, including both those needed to unify with