This diagnostic tells me an explicitly async call is implicit

[mattmassicotte]

Description

Perhaps I'm misunderstanding, but it sure looks to me like this call is explicitly asychronous.

 1 | class Foo {
   |       `- note: class 'Foo' does not conform to the 'Sendable' protocol
 2 |     init() async {
 3 | 
   :
10 | 
11 |     init() async {
12 |         let value = await Foo()
   |                           `- error: non-sendable type 'Foo' returned by implicitly asynchronous call to nonisolated function cannot cross actor boundary
13 | 
14 |         self.foo = value

Reproduction

class Foo {
    init() async {
    }
}

@MainActor
class Bar {
    let foo: Foo

    init() async {
        let value = await Foo()

        self.foo = value
    }
}

Expected behavior

I would not expect the diagnostic to tell me a call explicitly marked with async is implicit.

Environment

Apple Swift version 6.0-dev (LLVM bf8bbb910874156, Swift a0bb875)
Target: arm64-apple-macosx14.0

Additional information

No response