lean4-htt/tests/elab/coeM.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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/-
# Testing monad lift coercion elaborator
The functions inserted for the coercions are supposed to be inlined immediately during elaboration.
-/
set_option pp.mvars false
variable (p : Nat → Prop) (m : IO (Subtype p))
/-!
`Lean.Internal.liftCoeM`
-/
#check (m : (ReaderT Int IO) Nat)
/-!
`Lean.Internal.coeM`
-/
#check (m : IO Nat)
/-!
Making sure the monad lift coercion elaborator does not have side effects.
It used to be responsible for hinting that the LHSs of equalities were defeq, like in the following example.
It was checking that `Eq (some true)` and `Eq _` were defeq monads. The defeq check caused `_` to be solved as `some true`.
-/
/--
error: Invalid dotted identifier notation: The expected type of `.some` could not be determined
Hint: Using one of these would be unambiguous:
[apply] `some`
[apply] `Option.Rel.some`
-/
#guard_msgs in
example : some true = (some true).map id := by
refine show _ = .some true from ?_
rfl