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clarify distinct pointer type nil change (#20376)

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* clarify distinct pointer type `nil` change

* Update changelog.md [skip ci]

Co-authored-by: Clay Sweetser <Varriount@users.noreply.github.com>

* remove extra quote [skip ci]

Co-authored-by: Clay Sweetser <Varriount@users.noreply.github.com>
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metagn 2022-09-20 15:58:22 +03:00 • committed by GitHub
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changelog.md
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@ -29,7 +29,15 @@
- `nimPreviewDotLikeOps` is going to be removed or deprecated. - `nimPreviewDotLikeOps` is going to be removed or deprecated.
- The `{.this.}` pragma, deprecated since 0.19, has been removed. - The `{.this.}` pragma, deprecated since 0.19, has been removed.
- `nil` is no longer a valid value for distinct pointer types. - `nil` literals can no longer be directly assigned to variables or fields of `distinct` pointer types. They must be converted instead.
```nim
type Foo = distinct ptr int
# Before:
var x: Foo = nil
# After:
var x: Foo = Foo(nil)
```
- Removed two type pragma syntaxes deprecated since 0.20, namely - Removed two type pragma syntaxes deprecated since 0.20, namely
`type Foo = object {.final.}`, and `type Foo {.final.} [T] = object`. `type Foo = object {.final.}`, and `type Foo {.final.} [T] = object`.