7d60d8b563
previously, `#eval` would happily evaluate expressions that contain `sorry`, either explicitly or because of failing tactics. In conjunction with operations like array access this can lead to the lean process crashing, which isn't particularly great. So how `#eval` will refuse to run code that (transitively) depends on the `sorry` axiom (using the same code as `#print axioms`). If the user really wants to run it, they can use `#eval!`. Closes #1697
3 lines
220 B
Text
3 lines
220 B
Text
277a.lean:4:7-4:15: error: unknown identifier 'nonexistant'
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277a.lean:4:0-4:25: 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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