syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // This is not just for correctness; we also need this to constrain any params that may
context_before:     // Now check that the source trait ref satisfies all the where clauses of the target impl.
context_after:     // only be referenced via projection predicates.