{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"FnArg,"}]}
    FnArg, FnVal, ImmTy, Immediate, InterpCx, InterpResult, Machine, MemPlaceMeta, PlaceTy,
use super::{
    Projectable, Scalar, interp_ok, throw_ub, throw_unsup_format,