3770b3dcb8
This PR fixed typos: ``` pip install codespell --upgrade codespell --summary --ignore-words-list enew,forin,fro,happend,hge,ihs,iterm,spred --skip stage0 --check-filenames codespell --summary --ignore-words-list enew,forin,fro,happend,hge,ihs,iterm,spred --skip stage0 --check-filenames --regex '[A-Z][a-z]*' codespell --summary --ignore-words-list enew,forin,fro,happend,hge,ihs,iterm,spred --skip stage0 --check-filenames --regex "\b[a-z']*" ```
115 lines
2.5 KiB
Text
115 lines
2.5 KiB
Text
/-!
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# Dotted function notation can handle `@` and universe levels
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-/
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set_option warn.sorry false
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set_option linter.deprecated true
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set_option pp.mvars.anonymous false
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/-!
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Explicit `@`
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-/
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/-- info: [] : List Nat -/
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#guard_msgs in #check (@.nil Nat : List _)
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/-!
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Explicit `@` disables implicit lambda
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-/
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/--
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error: Type mismatch
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@List.nil
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has type
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{α : Type _} → List α
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but is expected to have type
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List ?_
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-/
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#guard_msgs in #check (@.nil : List _)
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/-!
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Universe levels.
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-/
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example : List Nat := .nil.{0}
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/--
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error: Type mismatch
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[]
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has type
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List.{1} ?_
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of sort `Type 1` but is expected to have type
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List.{0} Nat
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of sort `Type`
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-/
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#guard_msgs in
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example : List Nat := .nil.{1}
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/-- error: too many explicit universe levels for `List.nil` -/
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#guard_msgs in
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example : List Nat := .nil.{0,0}
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/-!
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Explicit plus universe levels also disables implicit lambda
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-/
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/--
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error: Type mismatch
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@List.nil
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has type
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{α : Type} → List α
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of sort `Type 1` but is expected to have type
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List Nat
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of sort `Type`
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-/
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#guard_msgs in example : List Nat := @.nil.{0}
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/-!
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Example of `@` from Floris van Doorn at https://github.com/leanprover/lean4/issues/10984
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-/
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example {α : Type} (f : ∀ {α}, List α → List α) : f (@.nil α) = .nil := sorry
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/-!
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Example of `@` plus universe levels adapted from https://github.com/leanprover/lean4/issues/10984
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-/
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example {α : Type u} (f : ∀ {α}, List α → List α) : f (@.nil.{u} α) = .nil := sorry
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/-!
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Example from Arthur Adjedj at https://github.com/leanprover/lean4/issues/8743
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-/
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/-- info: [2] : List Nat -/
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#guard_msgs in #check (List.cons.{0} 2 [] : List Nat)
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/-- info: [2] : List Nat -/
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#guard_msgs in #check (.cons.{0} 2 [] : List Nat)
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/--
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error: Type mismatch
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[2]
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has type
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List.{1} ?_
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of sort `Type 1` but is expected to have type
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List.{0} Nat
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of sort `Type`
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-/
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#guard_msgs in #check (.cons.{1} 2 [] : List Nat)
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/-!
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Regression test: This used to give a deprecation warning on the first `#check`.
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-/
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def MyNS1.List.nil' : List Nat := []
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@[deprecated MyNS1.List.nil' (since := "forever")] def MyNS2.List.nil' : List Int := []
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/-- info: MyNS1.List.nil' : List Nat -/
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#guard_msgs in
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open MyNS1 MyNS2 in #check (.nil' : List Nat)
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/--
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warning: `MyNS2.List.nil'` has been deprecated: Use `MyNS1.List.nil'` instead
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Note: The updated constant has a different type:
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List Nat
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instead of
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List Int
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Note: The updated constant is in a different namespace. Dot notation may need to be changed (e.g., from `x.nil'` to `MyNS1.List.nil' x`).
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---
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info: MyNS2.List.nil' : List Int
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-/
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#guard_msgs in
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open MyNS1 MyNS2 in #check (.nil' : List Int)
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