Version Used: 5.5.0-2.26110.7 (47f526d)

Steps to Reproduce:

#:property LangVersion=8.0
class C
{
    string f = $"X_{nameof(D.M)}";
    public D D { get; private set; }
}
class D
{
    public void M() { }
}

.NET Lab

Expected Behavior: Fails with error CS8400: Feature 'instance member in 'nameof'' is not available in C# 8.0. Please use language version 12.0 or greater.

Actual Behavior: Fails with error CS7038: Failed to emit module 'TestProject': Unable to determine specific cause of the failure.

Note: Originally reported by a customer internally over e-mail.

This is also a regression (no error is reported by for example Roslyn 5.0.0-2.26075.103 (123b078)), so we need to decide whether the langversion error should be reported or this should successfully compile again.