Abstract property access error occurs in non-abstract class constructors

[sirtrollraptor]

TypeScript Version: starting from 2.6.0-dev.20171010, 2.6.0-dev.20171015

Code

abstract class Animal {
  public abstract name: string;
}

class Cat extends Animal {
  public name = "Cat";
}

class Foo {
  constructor(animal: Animal) {
    animal.name;
  }
}

new Foo(new Cat());

Expected behavior:
No compilation error should occur.

Actual behavior:
index.ts(11,12): error TS2715: Abstract property 'name' in class 'Animal' cannot be accessed in the constructor.
This regression was introduced in #19005, as accessing an abstract property in any constructor causes this error, rather than the indented goal of disallowing abstract property accesses only in the constructors of abstract classes that are/extend the abstract class that the abstract property belongs to.

[RyanCavanaugh]

@sandersn can you take a look ASAP? Thanks!

[sandersn]

The error is just missing a check that the usage is inside the constructor of the declaring class, not just any constructor. I'll add the check.

[mhegazy]

The original change is 2.7 bound, so this fix needs to go into master.