Files
lean4/tests/elab/issue2981.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

62 lines
1.6 KiB
Lean4

/-!
Terms are often duplicated in lean. One example is default arguments
referring to earlier ones; observed in the wild with `Array.foldl` and friends.
Ideally, compiling a recursive definition will still only consider such a recursive call once.
-/
def dup (a : Nat) (b : Nat := a) := a + b
namespace TestingFix
def rec : Nat Nat
| 0 => 1
| n+1 => dup (dup (dup (rec n)))
decreasing_by trace "Tactic is run (ideally only once)"; decreasing_tactic
end TestingFix
namespace TestingGuessLex
-- GuessLex should run the tactic an extra time, that is expected
def rec : Nat Nat Nat
| 0, _m => 1
| n+1, m => dup (dup (dup (rec n (m + 1))))
decreasing_by trace "Tactic is run (ideally only twice)"; decreasing_tactic
end TestingGuessLex
namespace Subcontext
set_option linter.unusedVariables false
-- Now with a duplication into another context
-- We thread through `x` so that we can make the context mention something
-- that appears in the goal, else `mvarId.cleanup` will remove it
def dup2 (x : Nat) (a : Nat) (b : x x Nat := fun h => a) := a
namespace TestingFix
def rec : Nat Nat
| 0 => 1
| n+1 => dup2 n (rec n)
decreasing_by
trace "Tactic is run (ideally only once, in most general context)"
trace_state
decreasing_tactic
end TestingFix
namespace TestingGuessLex
-- GuessLex should run the tactic an extra time, that is expected
def rec : Nat Nat Nat
| 0, _m => 1
| n+1, m => dup2 n (rec n (m + 1))
decreasing_by
trace "Tactic is run (ideally only twice, in most general context)"
trace_state
decreasing_tactic
end TestingGuessLex