lean2/tests/lean/open_tst.lean

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section
check (1:nat) + 2
check add
end
section
variable a : nat
check a + a
check add a a
check a + 1
end
section
open - [class] nat
variable a : nat
check a + a
check add a a
check a + 1
definition foo1 : inhabited nat :=
_ -- Error inhabited instances was not loaded
end
section
open - [class] [decl] nat
variable a : nat
check a + a
check a + 1
definition foo2 : inhabited nat :=
_ -- Error inhabited instances was not loaded
end
section
open [class] nat
definition foo3 : inhabited nat :=
_
variable a : nat
check a + a
end