How Can I Resolve the 'cannot infer V' Error When Using Generic Interfaces in Go?

Inferring Type Parameters in Go: Resolving "cannot infer V" Error

When dealing with generic interfaces that support different types, you may encounter the "cannot infer V" error in Go, particularly in versions 1.20 and below. Here's how you can tackle this issue:

Go 1.21 and Higher

For Go 1.21 and later, the error is resolved without explicitly specifying type constraints. Type inference now considers method types when assigning values to an interface, allowing the compiler to infer type arguments from the provided methods.

Go 1.20 and Lower

In Go 1.20 and earlier, inferring the type of V from the concrete type implementing the ConfigStorage[K, V] constraint was not supported. To resolve the error, you need to explicitly provide the type parameters when calling the GetValue function, like so:

// Specify string for K and string for V
GetValue[string, string](fileStorage, "key")

With this modification, the compiler can now infer the type of V based on the provided types for K and the set method implementation.

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