44 lines
1.3 KiB
Scheme
44 lines
1.3 KiB
Scheme
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;;; Copyright 2023 Jessica Tallon
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;;;
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;;; Licensed under the Apache License, Version 2.0 (the "License");
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;;; you may not use this file except in compliance with the License.
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;;; You may obtain a copy of the License at
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;;;
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;;; http://www.apache.org/licenses/LICENSE-2.0
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;;;
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;;; Unless required by applicable law or agreed to in writing, software
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;;; distributed under the License is distributed on an "AS IS" BASIS,
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;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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;;; See the License for the specific language governing permissions and
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;;; limitations under the License.
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(define-module (goblins abstract-types)
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#:export (zilch
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zilch?
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<tagged>
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make-tagged
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make-tagged*
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tagged?
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tagged-label
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tagged-data))
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;; This is both a 2nd and secondary "bottom" or null/void type that's used
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;; within CapTP. This works alongside guile's *unspecified* bottom type.
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(define (make-zilch)
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(define-record-type <zilch>
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(_make-zilch)
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zilch?)
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(values (_make-zilch) zilch?))
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(define-values (zilch zilch?)
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(make-zilch))
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(define-record-type <tagged>
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(make-tagged label data)
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tagged?
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(label tagged-label)
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(data tagged-data))
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(define (make-tagged* label . args)
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(make-tagged label args))
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