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lean4/tests/elab_fail/synthorder.lean
Garmelon 08eb78a5b2 chore: switch to new test/bench suite (#12590)
This PR sets up the new integrated test/bench suite. It then migrates
all benchmarks and some related tests to the new suite. There's also
some documentation and some linting.

For now, a lot of the old tests are left alone so this PR doesn't become
even larger than it already is. Eventually, all tests should be migrated
to the new suite though so there isn't a confusing mix of two systems.
2026-02-25 13:51:53 +00:00

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class Foo (A : Type) (B : semiOutParam Type)
-- should be rejected, because C appears by itself in an out-param
instance [Foo A B] : Foo A (B × C) where
-- should be rejected, because non-out-param A can become an mvar
instance [Foo A Nat] : Foo Nat A where
set_option trace.Meta.synthOrder true
-- both instances should synthesize [Foo A B] first:
instance [Foo A B] [Foo B C] : Foo A C where
instance [Foo B C] [Foo A B] : Foo A C where
instance : Foo (Option A) A where
class Two (α) [One α]
class TwoHalf (α) [One α] extends Two α
class Three (α : Type) (β : outParam Type) [One β] [Two β]
-- should both be accepted and synthesize `Three α β` first:
class Four (α : Type) (β : outParam Type) [One β] [TwoHalf β] extends Three α β
instance [One β] [TwoHalf β] [Three α β] : Four α β where