[Issue 22792] Wrong inference of opApply

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22792

--- Comment #2 from moonlightsentinel at disroot.org ---
Slightly modified test case:

import core.stdc.stdio;

struct S
{
    int opApply(int delegate(ref const(int), ref int) dg)
    { puts("mutable int"); return 0; }
    int opApply(int delegate(ref const(int), ref const(int)) dg) const
    { puts("const int"); return 0; }
    int opApply(int delegate(ref const(int), ref string) dg)
    { puts("mutable str"); return 0; }
    int opApply(int delegate(ref const(int), ref const(string)) dg) const
    { puts("const str"); return 0; }
}
void main()
{
    S s;
    foreach (ref const(int) x, ref const(int) y; s) {}
    foreach (ref const(int) x, ref const(string) y; s) {}

    const S s2;
    foreach (ref const(int) x, ref const(int) y; s2) {}
    foreach (ref const(int) x, ref const(string) y; s2) {}
}

Up to      2.074.1: Success with output:
-----
const int
const str
const int
const str
-----

Since      2.075.1: Success with output:
-----
const int
mutable str
const int
const str
-----

--