syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"ImplSource,"}]}
source_snippet:     ImplSource, ImplSourceUserDefinedData, Normalized, Obligation, ObligationCause,
context_before: use crate::traits::{
context_after:     PolyTraitObligation, PredicateObligation, Selection, SelectionError, TraitObligation,