is duplicated by:

• SR-5274 Generic parameter 'S' could not be inferred when calling merging(_:uniquingKeysWith:) method on Dictionary<String, Any> instance

Issue Description:

There are two function of Dictionary could not use.

public mutating func merge<S>(_ other: S, uniquingKeysWith combine: (Dictionary.Value, Dictionary.Value) throws -> Dictionary.Value) rethrows where S : Sequence, S.Element == (Dictionary.Key, Dictionary.Value)

public func merging<S>(_ other: S, uniquingKeysWith combine: (Dictionary.Value, Dictionary.Value) throws -> Dictionary.Value) rethrows -> [Dictionary.Key : Dictionary.Value] where S : Sequence, S.Element == (Dictionary.Key, Dictionary.Value).

I tried the example, but I encountered a compile bug.
var dictionary = ["a": 1, "b": 2]
dictionary.merge(["a": 3, "c": 4]) { (current, _) in current }

let dictionary = ["a": 1, "b": 2]
let otherDictionary = ["a": 3, "b": 4]
let keepingCurrent = dictionary.merging(otherDictionary) { (current, _) in current }

Generic parameter 'S' could not be inferred.