compiler crash

[woruyu]

Bug description

mycode:
export class A{
private member_1_: typeOne = null;
public get member_1(): typeOne{
return 0;
}
}

const testClass = new A();
testClass.member_1.hello();

run:
asc xxx.ts --disableWarning --noEmit

result:
Whoops, the AssemblyScript compiler has crashed during compile :-(

Here is the stack trace hinting at the problem, perhaps it's useful?
AssertionError: assertion failed

If you see where the error is, feel free to send us a pull request. If not,
please let us know: https://github.com/AssemblyScript/assemblyscript/issues

Thank you!

expected behavior:
give me error message about my codes

Steps to reproduce

1.copy my codes to a file.
2. run asc to compile this file

AssemblyScript version

v0.27.18

[woruyu]

I update codes to test:
mycodes:
export class A{
private member_1_:number;
public get member_1(): number{
return this.member_1_;
}
}

const testClass = new A();
testClass.member_1.hello();

result: TS2339: Property 'hello' does not exist on type '~lib/number/F64'. It's right!

so, I guess the reason maybe be class's member has a undefined type. And use this member to call a function.