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30 lines
769 B
Scheme
30 lines
769 B
Scheme
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(define-library (srfi 145)
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(export assume)
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(import (scheme base))
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(cond-expand
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(elide-assumptions
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(begin
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(define-syntax assume
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(syntax-rules ()
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((assume expression objs ...)
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expression)
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((assume)
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(syntax-error "assume requires an expression"))))))
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(else
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(begin
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(define-syntax assume
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(syntax-rules ()
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((assume expression objs ...)
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(or expression
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(fatal-error "invalid assumption" 'expression objs ...)))
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((assume)
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(syntax-error "assume requires an expression")))))))
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(cond-expand
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(debug
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(begin
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(define fatal-error error)))
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(else
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(begin
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(define (fatal-error message . objs)
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(car 0))))))
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