Implicitly-opened existentials after explicit erasure require extra parentheses

[JessyCatterwaul]

Given

protocol P { }
struct S: P { }
func ƒ(_: some P) { }
let p: any P = S()

These compile:

ƒ(p)
ƒ((S() as any P))

This produces the error "Type 'any P' cannot conform to 'P'":

ƒ(S() as any P)

[JessyCatterwaul]

Never mind. It's horrible, but also working as intended.
https://github.com/apple/swift-evolution/blob/main/proposals/0352-implicit-open-existentials.md#suppressing-explicit-opening-with-as-any-p--as-any-p