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Issue Description:

In Swift 5.2 I am unable to set a default property value that contains a KeyPath. If the same code is written in the initializer it works fine. This code compiles fine on Swift 5.1.3 both MacOS and Linux.

``` swift

struct MyStruct1: I18nBindable {

**let** text: I18nString

**init**() {

    **self**.text = **Self**.t(for: \*Self\*.text) // \<– works fine

}

}

struct MyStruct2: I18nBindable {

**let** text: I18nString = **Self**.t(for: \*Self\*.text) // \<– Error: "Key path cannot refer to static member 'text'" – (this worked in Swift 5.1.3, but fails in 5.2)

}

```

Full details in text.swift

Steps to reproduce:

1. Install Swift 5.2 (Xcode Version 11.4 (11E146)) on MacOS 10.15.4 (19E266)

2. swift test.swift

Expected result: compiles successfully

Received result:

test.swift:20:46: error: key path cannot refer to static member 'text'

let text: I18nString = Self.t(for: \Self.text) // \<– Error: "Key path cannot refer to static member 'text'" – (this worked in Swift 5.1.3, but fails in 5.2)