This came from the 2.071 change of the import rules.

I don't know whether a dmd or phobos issue.
And it is a deprecation massage, so we can suppress.

It also relates to Issue 15826.

CODE:
import std.typecons;

void main(string[] args)
{
    auto a = new BlackHole!A;
    a.method();
}

interface A {
    abstract void method();
    
    import std.stdio; // default is private
    private alias a = int;
    private void ft(R)(R range) { } // non-template is visible
}

OUTPUT:
phobos\std\traits.d(3677): Deprecation: test.A.std is not visible from module traits
phobos\std\traits.d(3677): Deprecation: test.A.a is not visible from module traits
phobos\std\traits.d(3677): Deprecation: test.A.ft(R)(R range) is not visible from module traits