Inconsistent assignment analysis for async arrow IIFE's regarding class property declarations (sugar vs constructor assigning)

TypeScript Version: 4.0.0-dev.202000519

Search Terms: async IIFE Property is used before being assigned class declaration

Code

This works fine:

class MyClass {
	public foo = 0;

	constructor() {
		(async () => this.foo + 5)();
	}
}

This, on the other hand, errors:

class MyClass {
	public foo: number;

	constructor() {
		this.foo = 0;
		(async () => this.foo + 5)(); // errors?
	}
}

These two code snippets should be treated the same because the first snippet is sugar for the second.

Expected behavior: (async () => this.foo + 5)() should not have the error "Property 'foo' is used before being assigned."

Actual behavior: It errors

Playground Link: Here

Related Issues:

Beginne damit, die beiden Klassenbeispiele im verlinkten TypeScript Playground zu reproduzieren, und vergleiche die Zuweisungsanalyse für die Formen mit class-property und constructor-assignment. Untersuche die Behandlung von async arrow IIFEs und verifiziere, dass der gemeldete Fehler "used before being assigned" für den constructor-assignment-Fall nicht auftritt, während das bestehende Verhalten korrekt bleibt.