Report nullable warnings for user-defined conversions on tuple elements #29699
Description
[module: System.Runtime.CompilerServices.NonNullTypes]
class A
{
public static implicit operator C(A a) => new C();
}
class B : A
{
}
class C
{
static void F((B?, B) x, (B, B?) y)
{
(C, C?) c;
c = x;
c = y;
}
}Expected:
(14,13): warning CS8604: Possible null reference argument for parameter 'a'
in 'A.implicit operator C(A a)'
(15,13): warning CS8604: Possible null reference argument for parameter 'a'
in 'A.implicit operator C(A a)'
Actual:
(14,13): warning CS8619: Nullability of reference types in value of type '(B?, B)'
doesn't match target type '(C, C?)'.