"is not a constructor" should be detected in compile time as "used before its declaration."

TypeScript Version: 3.2.2
This repository demonstrates that I run in to the issue in ts@next.
https://github.com/qballer/tsbug

Search Terms:
constructor, lexical scope, run time error vs compile time
Code

const b = getB() 

function getB() {
    // will throw C is not a constructor in runtime 
    return new C() // ** 
}

// Will generate:  Class 'C' used before its declaration.
// const instanceOfC = new C()

class C {}

Expected behavior:
Should generate: Class 'C' used before its declaration.

Actual behavior:
Explodes in runtime with 'is not a constructor' error.

Playground Link:
Playground
Repo

Related Issues:

Comienza con el código de reproducción del repositorio qballer/tsbug enlazado y el ejemplo de TypeScript Playground; después, compara el diagnóstico existente para const instanceOfC = new C() con el caso getB(). Se considera terminado cuando el compilador informa "Class 'C' used before its declaration" para la llamada al constructor, en lugar de permitir el fallo en tiempo de ejecución "is not a constructor".