| L | Parsley.Internal.Common.Indexed, Parsley.Internal.Common |
| LAM | Parsley.Internal.Backend.Machine.Defunc |
| Lam | Parsley.Internal.Core.Lam |
| lamTerm | Parsley.Internal.Core.Defunc |
| lamTermBool | Parsley.Internal.Core.Defunc |
| LAM_S | Parsley.Internal.Core.Defunc, Parsley.Internal.Core, Parsley.Internal |
| Length | Parsley.Internal.Backend.Analysis.Relevancy |
| Let | |
| 1 (Data Constructor) | Parsley.Internal.Core.Lam |
| 2 (Data Constructor) | Parsley.Internal.Core.CombinatorAST |
| LetBinding | |
| 1 (Type/Class) | Parsley.Internal.Backend.Machine.LetBindings, Parsley.Internal.Backend.Machine |
| 2 (Data Constructor) | Parsley.Internal.Backend.Machine.LetBindings |
| letRec | Parsley.Internal.Backend.Machine.LetRecBuilder |
| LET_S | Parsley.Internal.Core.Defunc, Parsley.Internal.Core, Parsley.Internal |
| Lift2 | Parsley.Internal.Backend.Machine.Instructions, Parsley.Internal.Backend.Machine |
| LIFTED | Parsley.Internal.Core.Defunc, Parsley.Internal.Core, Parsley.Internal |
| LogEnter | Parsley.Internal.Backend.Machine.Instructions, Parsley.Internal.Backend.Machine |
| LogExit | Parsley.Internal.Backend.Machine.Instructions, Parsley.Internal.Backend.Machine |
| LogHandler | Parsley.Internal.Backend.Machine.Ops |
| logHandler | Parsley.Internal.Backend.Machine.Ops |
| LogOps | Parsley.Internal.Backend.Machine.InputOps, Parsley.Internal.Backend.Machine.Ops |
| LookAhead | Parsley.Internal.Core.CombinatorAST |
| lookAhead | Parsley.Internal.Core.Primitives, Parsley.Internal |