Function rustc_trans::middle::ty::maybe_walk_tyUnstable
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pub fn maybe_walk_ty<'tcx, F>(ty_root: &'tcx TyS<'tcx>, f: F)
Walks ty and any types appearing within ty, invoking the
callback f on each type. If the callback returns false, then the
children of the current type are ignored.
Note: prefer ty.walk() where possible.