syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// `AscribeUserType` statement in MIR.
context_before:     /// Stores the canonicalized types provided by the user. See also
context_after:     pub user_provided_sigs: LocalDefIdMap<CanonicalPolyFnSig<'tcx>>,