Detecting whether pointer target is comptime known

Help
1

In the sample code below, a points to a variable and b points to a constant:

var variable: i32 = 123;
const constant: i32 = 123;
const a = &variable;
const b = &constant;

test {
    @compileLog(a.*);
    @compileLog(b.*);
}

Compile Log Output:
@as(i32, [runtime value])
@as(i32, 123)

Is there a way to extract this information programmatically?