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gebner
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Apr 21, 2023
| #check (rfl : ((ListM.fix F 10).takeAsList 4).run [] = some ([10, 9, 8, 7], [7, 8, 9, 10])) | ||
| #check (rfl : | ||
| (((ListM.fix F 10).map fun n => n*n).takeAsList 3).run [] = some ([100, 81, 64], [8, 9, 10])) | ||
| example : ((ListM.fix F 10).takeAsList 4).run [] = some ([10, 9, 8, 7], [8, 9, 10]) := by |
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There are two changes here:
rflno longer unfoldsListMoperations because they're partial and/or opaque. (But therflwasunsafeanyhow.)- I optimized
ListM.fixso that it requires fewer invocations ofFto produce the same number of elements. (That's why the second part of the pair---which stores each invocation ofF---got shorter.)
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Oh my! This is amazing, thank you. bors merge |
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Pull request successfully merged into master. Build succeeded: |
ListM safeListM safe
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Hide the unsafe inductive powering
ListMbehind a safe API usingimplemented_by.The motivation is of course Scott's recent barrage of library_search improvements using ListM which marks everything as unsafe. I'd really like to stop the proliferation of unsafe, so that unsafe continues to be a meaningful indicator of memory unsafety or logical unsoundness.