mathlib4/MathlibTest/CalcQuestionMark.lean at master · Stars1233/mathlib4 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
import Mathlib.Tactic.Widget.Calc

/-!
Note that while the suggestions look incorrectly indented here,
this is an artifact of the rendering to a string for `guard_msgs` (https://github.com/leanprover/lean4/issues/7191).

When used from the widget that appears in VSCode, they insert correctly-indented code.
-/

/--
info: Create calc tactic:
  [apply] calc
    1 = 1 := by sorry
---
warning: declaration uses `sorry`
-/
#guard_msgs in
example : 1 = 1 := by
  have := 0
  calc?


/--
info: Create calc tactic:
  [apply] calc
    a ≤ a := by sorry
---
warning: declaration uses `sorry`
-/
#guard_msgs in
example (a : Nat) : a ≤ a := by
  calc?

-- an indented `calc?`

/--
info: Create calc tactic:
  [apply] calc
    a ≤ a := by sorry
---
warning: declaration uses `sorry`
-/
#guard_msgs in
example (a : Nat) : a ≤ a := by
  all_goals
    calc?

-- a deliberately long line
/--
info: Create calc tactic:
  [apply] calc
    1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 +
              1 +
            1 +
          1 =
        8 + 8 + 8 + 8 :=
      by sorry
---
warning: declaration uses `sorry`
-/
#guard_msgs in
example :
    1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 +
    1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 +
    1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 +
    1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 = 8 + 8 + 8 + 8 := by
  calc?