syntax_data: {"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let rvalue = Rvalue::Cast(cast_kind, discr_ty_bits, discr.ty);
context_before:     // Cast the resulting value to the actual discriminant integer type.
context_after:     let discr_in_discr_ty =