e9a318df16
This PR rewords the "application type mismatch" error message so that the argument and its type precede the application expression.
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: The argument
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Nat
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has type
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Type
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of sort `Type 1` but is expected to have type
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Prop
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of sort `Type` in the application
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@Eq Nat
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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: The argument
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Nat
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has type
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Type
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of sort `Type 1` but is expected to have type
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Prop
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of sort `Type` in the application
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@Eq Nat
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-/
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#guard_msgs in #reduce elab_1eq1
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end
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