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Showing content from https://fsharp.github.io/fsharp-core-docs/reference/fsharp-core-equalityconditionalonattribute.html below:

EqualityConditionalOnAttribute (FSharp.Core) | FSharp.Core

Namespace: FSharp.Core

Assembly: FSharp.Core.dll

Base Type: Attribute

This is an attribute type definition

This attribute is used to indicate a generic container type satisfies the F# 'equality' constraint only if a generic argument also satisfies this constraint.

For example, adding this attribute to parameter 'T on a type definition C<'T> means that a type C only supports equality if the type X also supports equality and all other conditions for C to support equality are also met. The type C<'T> can still be used with other type arguments, but a type such as C<(int -> int)> will not support equality because the type (int -> int) is an F# function type and does not support equality. This attribute will be ignored if it is used on the generic parameters of functions or methods.

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