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doc: document issue

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cc @dselsam
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Leonardo de Moura 2020-02-18 10:52:12 -08:00
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4
tests/elabissues/error_aux_decl_exists.lean
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@ -17,3 +17,7 @@ def foo : Nat → Unit
-- error: equation compiler failed to create auxiliary declaration 'foo._main'
-- nested exception message:
-- invalid declaration, a declaration named 'foo._main' has already been declared
/-
[Leo]: Rob Lewis reported the issue for Lean3 a few years ago. I told him I would not fix it since I think it is obvious to understand the problem. We will write a new equation compiler. We will fix it if it only if it doesn't increase the complexity.
-/