36 lines
1,022 B
Text
36 lines
1,022 B
Text
example (n : Nat) (a : Int) : a = 22 :=
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calc
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a = 2 ^ n := sorry -- error
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_ = (22 : Int) := sorry
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example (n : Nat) (a : Int) : a = 22 :=
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calc
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a = (37 : Int) := sorry
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_ = 2 ^ n := sorry -- should be same error as above
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_ = (22 : Int) := sorry
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example (n : Nat) (a : Int) : a = (2 : Int) ^ n :=
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calc
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a = (37 : Int) := sorry
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_ = 2 ^ n := sorry -- should be same error as above
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example (n : Nat) (h : n = 42) : 42 = (n : Int) :=
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calc
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(42 : Int) = 42 := rfl
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_ = n := h ▸ rfl
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--^ coe needs to be inserted here
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example (n : Nat) (h : n = 42) : 42 = (n : Int) :=
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calc
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(42 : Int) = 42 := rfl -- TODO: type of 42 should match goal (i.e., `Int`)
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_ = n := h ▸ rfl
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--^ coe needs to be inserted here
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example (n : Nat) (h : n = 42) : 42 = (n : Int) :=
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calc
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(_ : Int) = 42 := rfl -- TODO: type of 42 should match goal (i.e., `Int`)
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_ = n := h ▸ rfl
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--^ coe needs to be inserted here
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example := calc 1 = 1 := rfl
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example := by calc 1 = 1 := rfl
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