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[ deprecate ] Relation/Binary.PropositionalEquality.inspect (#1580 / #1630 / #1930 redux) #2934

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[ deprecate ] Relation/Binary.PropositionalEquality.inspect (#1580 / #1630 / #1930 redux) #2934

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5813fe6
[ deprecate ] `Relation/Binary.PropositionalEquality.inspect`
jamesmckinna Feb 6, 2026
e6e91d3
add : `CHANGELOG`
jamesmckinna Feb 6, 2026
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7 changes: 7 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -6,6 +6,13 @@ The library has been tested using Agda 2.8.0.
Highlights
----------

### Deprecated `Relation.Binary.PropositionalEquality.inspect`, in favour
of `with ... in ...` syntax (issue #1580; PRs #1630, #1930, #2934)

* In `Relation.Binary.PropositionalEquality`, the record type `Reveal_·_is_`
and its principal mode of use, `inspect`, have been deprecated in favour of
the new `with ... in ...` syntax. See the documentation of [with-abstraction equality](https://agda.readthedocs.io/en/v2.9.0/language/with-abstraction.html#with-abstraction-equality).

Bug-fixes
---------

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43 changes: 20 additions & 23 deletions src/Relation/Binary/PropositionalEquality.agda
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Expand Up @@ -91,29 +91,6 @@ module _ (_≟_ : DecidableEquality A) {x y : A} where
≢-≟-identity = dec-no (x ≟ y)


------------------------------------------------------------------------
-- Inspect

-- Inspect can be used when you want to pattern match on the result r
-- of some expression e, and you also need to "remember" that r ≡ e.

-- See README.Inspect for an explanation of how/why to use this.

-- Normally (but not always) the new `with ... in` syntax described at
-- https://agda.readthedocs.io/en/v2.6.4/language/with-abstraction.html#with-abstraction-equality
-- can be used instead."

record Reveal_·_is_ {A : Set a} {B : A → Set b}
(f : (x : A) → B x) (x : A) (y : B x) :
Set (a ⊔ b) where
constructor [_]
field eq : f x ≡ y

inspect : ∀ {A : Set a} {B : A → Set b}
(f : (x : A) → B x) (x : A) → Reveal f · x is f x
inspect f x = [ refl ]


------------------------------------------------------------------------
-- DEPRECATED NAMES
------------------------------------------------------------------------
Expand All @@ -130,3 +107,23 @@ isPropositional = Irrelevant
Please use Relation.Nullary.Irrelevant instead. "
#-}

-- Version 2.4

record Reveal_·_is_ {A : Set a} {B : A → Set b}
(f : (x : A) → B x) (x : A) (y : B x) :
Set (a ⊔ b) where
constructor [_]
field eq : f x ≡ y

inspect : ∀ {A : Set a} {B : A → Set b}
(f : (x : A) → B x) (x : A) → Reveal f · x is f x
inspect f x = [ refl ]

{-# WARNING_ON_USAGE Reveal_·_is_
"Warning: Reveal_·_is_ was deprecated in v2.4.
Please use new `with ... in` syntax described at https://agda.readthedocs.io/en/v2.9.0/language/with-abstraction.html#with-abstraction-equality instead."
#-}
{-# WARNING_ON_USAGE inspect
"Warning: inspect was deprecated in v2.4.
Please use new `with ... in` syntax described at https://agda.readthedocs.io/en/v2.9.0/language/with-abstraction.html#with-abstraction-equality instead."
#-}
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