Files
lean4/tests/elab/repr_empty.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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Lean4

/-!
# Validation of `Repr Empty` instance
While it may seem unnecessary to have Repr, it prevents the automatic derivation
of Repr for other types when `Empty` is used as a type parameter.
This is a simplified version of an example from the "Functional Programming in Lean" book.
The Empty type is used to exclude the `other` constructor from the `Prim` type.
-/
inductive Prim (special : Type) where
| plus
| minus
| other : special Prim special
deriving Repr
/-!
Check that both Repr's work
-/
/-- info: Prim.plus -/
#guard_msgs in
open Prim in
#eval (plus : Prim Int)
/-- info: Prim.minus -/
#guard_msgs in
open Prim in
#eval (minus : Prim Empty)