Fix Issue 22769: ICE on IFTI call inside interpolated string (dlang#22784)

Author: oCHIKIo

compiler/src/dmd/expressionsem.d

@@ -5852,8 +5852,10 @@ private extern (C++) final class ExpressionSemanticVisitor : Visitor
             {
                 arguments.push(makeTemplateItem(Id.InterpolatedExpression, str));
                 Expressions* mix = new Expressions(new StringExp(e.loc, str));
-                // FIXME: i'd rather not use MixinExp but idk how to do it lol
-                arguments.push(new MixinExp(e.loc, mix));
+                auto mixinExp = new MixinExp(e.loc, mix);
+                auto res = mixinExp.expressionSemantic(sc);
+                res = resolveProperties(sc, res);
+                arguments.push(res);
             }
         }
 

compiler/test/compilable/issue22769.d

@@ -0,0 +1,19 @@
+// https://github.com/dlang/dmd/issues/22769
+
+int foo()() => 0;
+
+void bar()
+{
+    cast(void) i"$(foo)";
+}
+
+struct OutBuffer
+{
+    void opOpAssign(string op, T...)(T args) {}
+}
+
+void qux()
+{
+    OutBuffer buf;
+    buf ~= i"$(foo)";
+}