Bug 23617 – traits(child) compile error need this for something that doesn't need this

This code WORKS: ``` struct S { void foo() {} } struct Wrapper { size_t currentIndex; S[] arrayOfS; auto opDispatch(string name, T ...)(T t) { assert(currentIndex < arrayOfS.length); alias member = __traits(getMember, S, name); return __traits(child, arrayOfS[this.currentIndex], member)(t); } } void main() { Wrapper w; w.opDispatch!"foo"(); } ``` But change the alias to inline: ``` struct S { void foo() {} } struct Wrapper { size_t currentIndex; S[] arrayOfS; auto opDispatch(string name, T ...)(T t) { assert(currentIndex < arrayOfS.length); // no more separate alias return __traits(child, arrayOfS[this.currentIndex], __traits(getMember, S, name))(t); } } void main() { Wrapper w; w.opDispatch!"foo"(); } ``` And get: wtflol.d(10): Error: symbol expected as second argument of __traits `child` instead of `this.foo` wtflol.d(16): Error: template instance `wtflol.Wrapper.opDispatch!"foo"` error instantiating OR, change the `this.currentIndex` to just `currentIndex` in either example and get: wtflol.d(10): Error: need `this` for `currentIndex` of type `ulong` So both arguments are attaching things incorrectly.

@RazvanN7 created dlang/dmd pull request #14807 "Fix Issue 23617 - traits(child) compile error need this for something that doesn't need this" fixing this issue: - Fix Issue 23617 - traits(child) compile error need this for something that doesn't need this https://github.com/dlang/dmd/pull/14807

dlang/dmd pull request #14807 "Fix Issue 23617 - traits(child) compile error need this for something that doesn't need this" was merged into master: - 5028d8ea204cd57030eaceaf16bf5ae43ea130de by RazvanN7: Fix Issue 23617 - traits(child) compile error need this for something that doesn't need this https://github.com/dlang/dmd/pull/14807