lean4-htt/tests/elab/doNotation1.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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open Lean
def f : IO Nat :=
pure 0
def g (x : Nat) : IO Nat :=
pure (x + 1)
def g1 {α : Type} (x : α) : IO (α × α) :=
pure (x, x)
def g2 (p : Nat × Nat) : Nat :=
p.1
-- set_option trace.Elab.definition true
def h (x : Nat) : StateT Nat IO Nat := do
let s ← get
let a ← f -- liftM inserted here
let b ← g1 1 -- liftM inserted here
let x := g2 b
IO.println b
pure (s+a)
def myPrint {α} [ToString α] (a : α) : IO Unit :=
IO.println s!">> {a}"
def h₂ (x : Nat) : StateT Nat IO Nat := do
let a ← h 1; -- liftM inserted here
IO.println x
let b ← g1 a -- liftM inserted here
if a > 100 then throw $ IO.userError "Error"
myPrint b.1 -- liftM inserted here
pure (a + 1)
def h₃ (x : Nat) : StateT Nat IO Nat := do
let m1 := do -- Type inferred from application below
discard <| g x -- liftM inserted here
IO.println 1
let m2 (y : Nat) := do -- Type inferred from application below
discard <| h (x+y) -- liftM inserted here
myPrint y -- liftM inserted here
let a ← h 1 -- liftM inserted here
IO.println x
let b ← g1 a; -- liftM inserted here
if a > 100 then throw $ IO.userError "Error"
myPrint b.1 -- liftM inserted here
m1
m2 a
pure 1
def tst0 : IO Unit := do
let a ← f
let x := a + 1
IO.println "hello"
IO.println x
def tst1 : IO Unit := do
let a ← f;
let x := a + 1;
IO.println "hello";
IO.println x;
def tst2 : IO Unit := do
let x := ← g $ (←f) + (←f);
IO.println "hello";
IO.println x
def tst3 : IO Unit := do
if (← g 1) > 0 then
IO.println "gt"
else
let x ← f;
let y ← g x;
IO.println y
def pred (x : Nat) : IO Bool := do
return (← g x) > 0
def tst4 (x : Nat) : IO Unit := do
if ← pred x then
IO.println "is true"
else
IO.println "is false"
def pred2 (x : Nat) : IO Bool := do
return x > 0
def tst5 (x : Nat) : IO (Option Nat) :=
if x > 10 then pure x else pure none
def tst6 (x : Nat) : StateT Nat IO (Option Nat) :=
if x > 10 then g x else pure none
syntax:max (name := doHash) "#" : term
partial def expandHash : Syntax → StateT Bool MacroM Syntax
| Syntax.node i k args =>
if k == `doHash then do set true; `(←MonadState.get)
else do
let args ← args.mapM expandHash;
pure $ Syntax.node i k args;
| stx => pure stx
@[macro Lean.Parser.Term.do] def expandDo : Macro :=
fun stx => do
let (stx, expanded) ← expandHash stx false;
if expanded then pure stx
else Macro.throwUnsupported
def tst7 : StateT (Nat × Nat) IO Unit := do
if #.1 == 0 then
IO.println "first field is zero"
else
IO.println "first field is not zero"
/-- info: tst7 : StateT (Nat × Nat) IO Unit -/
#guard_msgs in
#check tst7
/--
info: first field is zero
---
info: ((), 0, 2)
-/
#guard_msgs in
#eval tst7.run (0, 2)
def f1 (x : Nat) : StateT Nat IO Nat := do
IO.println "hello"
let mut z := x
let mut y := x
modify (· + 10)
if x > 0 then
y := 3*y
z := z + (← get) + (← get)
if x < (← get) then
IO.println s!">> {y}"
return y
else
IO.println s!"++ {z}"
return y+z
def f1Test : IO Unit := do
unless (← f1 30 |>.run' 0) == 140 do
throw $ IO.userError $ "error"
unless (← f1 5 |>.run' 0) == 15 do
throw $ IO.userError $ "error"
/--
info: hello
++ 50
hello
>> 15
-/
#guard_msgs in
#eval f1Test