[Issue 19696] New: ReplaceType replaces type with the type forwarding using alias this

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19696

          Issue ID: 19696
           Summary: ReplaceType replaces type with the type forwarding
                    using alias this
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: sludwig at outerproduct.org

Test case:

---
import std.typecons : ReplaceType;

struct S {
    T!int t;
    alias t this;
}

struct T(U) {}

// fails with !is(T!int == S)
static assert(is(ReplaceType!(float, float, S) == S));
---

If T is instead a non-template type, the result is S, as expected.

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