45 lines
963 B
Text
45 lines
963 B
Text
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/--
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error: tactic 'decide' proved that the proposition
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False
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is false
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---
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error: cannot evaluate expression that depends on the `sorry` axiom.
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Use `#eval!` to evaluate nevertheless (which may cause lean to crash).
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-/
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#guard_msgs in
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#eval show Nat from False.rec (by decide)
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/--
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warning: declaration uses 'sorry'
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---
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error: cannot evaluate expression that depends on the `sorry` axiom.
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Use `#eval!` to evaluate nevertheless (which may cause lean to crash).
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-/
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#guard_msgs in
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#eval #[1,2,3][2]'sorry
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/--
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warning: declaration uses 'sorry'
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---
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info: 3
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-/
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#guard_msgs in
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#eval! #[1,2,3][2]'sorry
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/-
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With this test I wanted to show that `#eval!` can be used to do unsafe operations. Under
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normal circumstances this actually works with the output below, but the `Linux Debug` CI build
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catches it and complains. Maybe too bold to have this in the test suite.
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/--
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warning: declaration uses 'sorry'
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---
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info: 3
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-/
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#guard_msgs in
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#eval! (#[1,2,3].pop)[2]'sorry
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-/
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