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+# `@default` attribute
+
+| Field           | Value                                                           |
+|-----------------|-----------------------------------------------------------------|
+| DIP:            | (number/id -- assigned by DIP Manager)                          |
+| Review Count:   | 0 (edited by DIP Manager)                                       |
+| Author:         | Dennis Korpel (dkorpel@gmail.com)                               |
+| Implementation: |                                                                 |
+| Status:         | Will be set by the DIP manager (e.g. "Approved" or "Rejected")  |
+
+## Abstract
+
+Add a `@default` attribute, which removes the effect of lexically preceding attributes.
+
+## Contents
+* [Rationale](#rationale)
+* [Prior Work](#prior-work)
+* [Description](#description)
+* [Breaking Changes and Deprecations](#breaking-changes-and-deprecations)
+* [Reference](#reference)
+* [Copyright & License](#copyright--license)
+* [Reviews](#reviews)
+
+## Rationale
+
+D supports [many attributes](https://dlang.org/spec/attribute.html).
+When a multitude of attributes needs to apply to a multitude of declarations, it can lead to visual noise from
+repeating the attribute names, colloquially called 'attribute soup'.
+
+```D
+struct S
+{
+    private void f() const @nogc nothrow pure @safe
+    {
+
+    }
+
+    private void g() const @nogc nothrow pure @safe
+    {
+
+    }
+
+    // ...
+}
+```
+
+One way to mitigate this is by using the `Attribute:` syntax, which will make the attribute apply to all following declarations until the end of the scope the attribute appears in.
+
+```D
+struct S
+{
+    @nogc nothrow pure @safe:
+    private:
+    const:
+
+    void f()
+    {
+
+    }
+
+    void g()
+    {
+
+    }
+
+    // ...
+}
+// attributes' influence ends here
+```
+
+This reduces the repetition of attributes, but it becomes a problem when there are a few declarations that need an exception.
+Sometimes this can be solved by annotating the exceptional declaration with an inverse attribute:
+
+| Attribute                | Undone by           |
+|--------------------------|---------------------|
+| `private`                | `public`            |
+| `@system`                | `@safe`             |
+| `extern(C)`              | `extern(D)`         |
+| `nothrow`                | `throw`             |
+| `pragma(inline, true)`   | `pragma(inline)`    |
+
+However, most attributes do not have an inverse that resets it to the default:
+
+- `align()`
+- `deprecated`
+- `static`
+- `extern`
+- `abstract`
+- `final`
+- `override`
+- `synchronized`
+- `scope`
+- `const`
+- `immutable`
+- `inout`
+- `shared`
+- `__gshared`
+- `pure`
+- `@disable`
+- `@nogc`
+- `@property`
+- `@UserDefinedAttribute`
+
+Moreover, because function attributes are inferred in template functions, forcing them back to the default is not always desirable either.
+Consider:
+
+```
+struct S
+{
+    @nogc nothrow pure @safe:
+
+    void f() { }
+
+    void g() { }
+
+    void toString(O)(ref O sink) if (isOutputRange!(O, char))
+    {
+    }
+}
+```
+
+In this case, the `toString` method should not force the provided Output Range to have an implementation of `sink.put` with all function attributes, but
+neither should `toString` be denied those attributes when it can infer them.
+The only option here is to place all template methods above the `@nogc nothrow pure @safe:` line, or go back to 'attribute soup' by repeating all function attributes for individual members.
+
+What is really desired is something to specify that attributes on `toString` should go back to the default state,
+which this DIP proposes in the form of the `@default` attribute.
+
+## Prior Work
+
+- [DIP 1029 - Add throw as Function Attribute](http://dlang.org/dips/1029)
+The `throw` attribute was added to address the lack of a way to invert the effect of `nothrow:`.
+However, it has not been implemented yet, and can be superseded by this DIP.
+
+- [DIP 1012 - Function Attributes](http://dlang.org/dips/1012)
+Proposes to move function attributes to `core.attribute` enabling traditional methods of attribute manipulation (`AliasSeq`) and introspection.
+This DIP has been abandoned.
+
+## Alternatives
+
+It has been proposed before that attributes could take a boolean parameter evaluated at CTFE (e.g. `@safe(x && y)`), or reset to the default by passing the `default` keyword as a parameter.
+This allows more precision, but it is more complex and verbose:
+
+```D
+@nogc nothrow pure @safe:
+
+// ...
+
+void f(T)(T x) @nogc(default) @nothrow(default) pure(default) @safe(default)
+{
+
+}
+```
+
+Another option is to use `@default` to specify default function attributes for regular functions, but not functions with attribute inference.
+```D
+struct S
+{
+    @default @nogc nothrow pure @safe:
+
+    void f() {}    // attributes apply here
+
+    auto g(T)() {} // does not apply here
+}
+```
+However, this does not provide a way to invert attributes that aren't inferred.
+Neither does it provide a way to invert function attributes on functions without attribute inference.
+
+```
+struct S
+{
+@default @nogc const:
+
+    void usesGc() {} // out of luck, not a template
+
+    void mutates(T)() {} // out of luck, `const` is not inferred
+}
+```
+
+### Syntax
+
+The syntax `@default` is chosen because `default` is already a reserved keyword, but it may not be the clearest name.
+A different name, such as `@reset`, could be considered, despite it potentially being used as a User Defined Attribute already.
+
+The `@` could be omitted when using the `default` keyword, but it is suggested to keep it to make it clear it's related to attributes, and not types or the `default` statement.
+
+## Description
+
+The `@default` attribute is added as an `AtAttribute`.
+
+```diff
+AtAttribute:
++   @ default
+    @ disable
+    @ nogc
+    @ live
+    Property
+    @ safe
+    @ system
+    @ trusted
+    UserDefinedAttribute
+```
+
+The `@default` attribute is not attached to any declarations.
+Instead, it prevents any lexically preceding attributes from applying to the declarations that would have the `@default` attribute applied to them.
+
+```
+@safe pure nothrow:
+private:
+
+// ...
+
+@default @safe:
+
+void normalFunc() // public, and only @safe
+{
+
+}
+
+@default private void templateFunc(R)(R range) // private, all attributes inferred
+{
+    foreach(e; range) {}
+}
+
+private @safe pure @default void noAt(); // no attributes apply
+```
+
+## Breaking Changes and Deprecations
+
+Since `default` is a keyword, existing User Defined Attributes cannot be called `@default`, so there is no breakage.
+
+## Reference
+- [Attributes in the specification](https://dlang.org/spec/attribute.html)
+
+## Copyright & License
+Copyright (c) 2022 by the D Language Foundation
+
+Licensed under [Creative Commons Zero 1.0](https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt)
+
+## Reviews
+The DIP Manager will supplement this section with a summary of each review stage
+of the DIP process beyond the Draft Review.