1db53b39c4
This PR rewords the `application type mismatch` error message by more specifically mentioning that the problem is with the final argument. This is useful when the same argument is passed to the function multiple times. We decided against using a wording which specifically mentions the "function expression", because users who are not used to currying might not think of the `f a` in `f a b` as a function.
58 lines
1.2 KiB
Text
58 lines
1.2 KiB
Text
import Lean
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/-- info: And.intro {a b : Prop} (left : a) (right : b) : a ∧ b -/
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#guard_msgs in
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#check And.intro
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/--
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info: @Or.rec : ∀ {a b : Prop} {motive : a ∨ b → Prop},
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(∀ (h : a), motive ⋯) → (∀ (h : b), motive ⋯) → ∀ (t : a ∨ b), motive t
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-/
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#guard_msgs in
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#check @Or.rec
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/-- info: Eq.{u_1} {α : Sort u_1} : α → α → Prop -/
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#guard_msgs in
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#check Eq
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/--
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info: @Eq.rec : {α : Sort u_2} →
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{a : α} → {motive : (a_1 : α) → a = a_1 → Sort u_1} → motive a ⋯ → {a_1 : α} → (t : a = a_1) → motive a_1 t
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-/
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#guard_msgs in
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#check @Eq.rec
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/-!
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The `#check` command also typechecks the result to help users debug buggy elaborators.
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-/
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section
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open Lean
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def expr_1eq1 : Expr := mkApp3 (.const ``Eq [0]) (.const ``Nat []) (mkNatLit 1) (mkNatLit 1)
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elab "elab_1eq1" : term => return expr_1eq1
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/--
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error: Application type mismatch: In the appplication
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@Eq Nat
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the final argument
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Nat
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has type
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Type : Type 1
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but is expected to have type
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Prop : Type
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-/
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#guard_msgs in #check elab_1eq1
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/--
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error: Application type mismatch: In the appplication
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@Eq Nat
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the final argument
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Nat
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has type
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Type : Type 1
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but is expected to have type
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Prop : Type
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-/
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#guard_msgs in #reduce elab_1eq1
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end
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