↰ base.ThenElse[R:iso,imm,mut,read]

• base.Abort/0
• base.Action/1
• base.ActionMatch/2
• base.Actions/0
• base.As/1
• base.Assert/0
• base.AssertCont/1
• base.AtomiseStr/0
• base.Block/0
• base.Block/1
• base.BlockIf/1
• base.Bool/0
• base.Box/1
• base.Byte/0
• base.Bytes/0
• base.Bytess/0
• base.CheapHash/0
• base.Collection/0
• base.CompareFloats/0
• base.CompareInts/0
• base.CompareNats/0
• base.Condition/0
• base.Consumer/1
• base.Consumer/2
• base.Consumer/3
• base.Continuation/3
• base.ControlFlow/0
• base.ControlFlow/1
• base.ControlFlowBreak/0
• base.ControlFlowBreak/1
• base.ControlFlowContinue/0
• base.ControlFlowContinue/1
• base.ControlFlowMatch/2
• base.ControlFlowReturn/1
• base.Count/0
• base.Count/1
• base.Debug/0
• base.Either/2
• base.EitherMatch/3
• base.EmptyMap/2
• base.Entry/2
• base.Error/0
• base.Extensible/1
• base.Extension/2
• base.F/1
• base.F/2
• base.F/3
• base.F/4
• base.F/5
• base.FOrdering/0
• base.False/0
• base.Float/0
• base.HasIdentity/0
• base.Hasher/0
• base.Info/0
• base.InfoVisitor/1
• base.Infos/0
• base.Int/0
• base.LList/0
• base.LList/1
• base.LListMatch/2
• base.LListMatchRead/2
• base.Lens/2
• base.Let/0
• base.Let/2
• base.LinkedHashMap/2
• base.LinkedLens/2
• base.List/0
• base.List/1
• base.ListView/1
• base.ListViews/0
• base.LoopBody/1
• base.MF/1
• base.MF/2
• base.MF/3
• base.MF/4
• base.MF/5
• base.Magic/0
• base.Main/0
• base.Map/2
• base.MapMapImm/3
• base.MapMapMut/3
• base.MapMapRead/3
• base.Maps/0
• base.Nat/0
• base.Opt/1
• base.OptFlatMap/2
• base.OptMap/2
• base.OptMatch/2
• base.Opts/0
• base.Ordering/0
• base.OrderingMatch/1
• base.Regex/0
• base.Regexs/0
• base.Res/0
• base.Res/1
• base.Res/2
• base.ResMap/3
• base.ResMapErr/3
• base.ResMatch/3
• base.ReturnStmt/1
• base.Sealed/0
• base.SimpleStr/0
• base.Str/0
• base.StrMap/1
• base.Stringable/0
• base.ThenElse/1
• base.ToHash/0
• base.ToImm/1
• base.ToIso/1
• base.Todo/0
• base.True/0
• base.Try/0
• base.UTF16/0
• base.UTF8/0
• base.Unreachable/0
• base.UpdateVar/1
• base.Var/0
• base.Var/1
• base.Void/0

mut .then: R,
mut .else: R,