lean4-htt/tests/lean/no_meta_rec_inst.lean at fa19b3c94de687ecbcdbc8ba53e88472efb3778a - max/lean4-htt - maxgit: wireguard access, git repository.

max/lean4-htt

Leonardo de Moura 6d9c9b3f9a feat(library/type_context): avoid auxiliary definitions introduced by the equation compiler from being used in the type class resolution procedure

This can only happen in meta definitions, but the user may be confused
by this behavior.

2017-02-04 15:56:54 -08:00

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 class has_false (α : Type) :=
 (f : false)
 meta def n_has_false : has_false ℕ :=
 by apply_instance -- Error, the "recursive" instance (n_has_false : has_false ℕ) should not be used in type class resolution