3a457e6ad6
Many of our tests in `tests/lean/run/` produce output from `#eval` (or `#check`) statements, that is then ignored. This PR tries to capture all the useful output using `#guard_msgs`. I've only done a cursory check that the output is still sane --- there is a chance that some "unchecked" tests have already accumulated regressions and this just cements them! In the other direction, I did identify two rotten tests: * a minor one in `setStructInstNotation.lean`, where a comment says `Set Nat`, but `#check` actually prints `?_`. Weird? * `CompilerProbe.lean` is generating empty output, apparently indicating that something is broken, but I don't know the signficance of this file. In any case, I'll ask about these elsewhere. (This started by noticing that a recent `grind` test file had an untested `trace_state`, and then got carried away.)
25 lines
641 B
Text
25 lines
641 B
Text
def allPairs (xs : List α) (ys : List β) : List (α × β) :=
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let rec aux
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| [], r => r
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| x::xs, r =>
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let rec aux₂
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| [], r => r
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| y::ys, r => (x, y) :: r
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aux₂ ys (aux xs r)
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aux xs []
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def allPairsFixed (xs : List α) (ys : List β) : List (α × β) :=
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let rec aux
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| [], r => r
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| x::xs, r =>
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let rec aux₂
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| [], r => r
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| y::ys, r => aux₂ ys ((x, y) :: r)
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aux₂ ys (aux xs r)
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aux xs []
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example : (allPairsFixed [1, 2, 3] ['a', 'b']) = [(1, 'b'), (1, 'a'), (2, 'b'), (2, 'a'), (3, 'b'), (3, 'a')] :=
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rfl
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example : (allPairsFixed (List.iota 3) (List.iota 4) |>.length) = 12 :=
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rfl
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