A reduced program:


int foo(int n, lazy int x) {
    int inner() {
        n--;
        return foo(n, inner());
    };
    return n <= 0 ? n : inner();
}
void main() {
    assert(foo(10, 1) == 0);
}



With DMD 2.055beta it compiles and runs correctly.

But compiling it with -inline DMD gives:

test.d(4): Error: delegate test.foo.inner.__dgliteral3 is a nested function and cannot be accessed from foo