Bug 24386 – [REG 2.095.1] constructor has no function body with return type inference

The following code does not compile since DMD 2.095.1: ``` template FunctionParameters(alias F) { static if (is(typeof(F) P == __parameters)) alias FunctionParameters = P; } template numConstructorOverloads(Overloads...) { static if (Overloads.length == 0) enum numConstructorOverloads = false; else enum numConstructorOverloads = __traits(getOverloads, FunctionParameters!(Overloads[0]), "__ctor").length + numConstructorOverloads!(Overloads[1 .. $]); } enum MIXIN = q{ this(Params...)(auto ref Params params) if (numConstructorOverloads!(__traits(getOverloads, typeof(this), "__ctor"))) { } }; struct Wrapper(T) { T data; } struct Struct1 { Wrapper!(Struct2)* splitRef; this(long); this(int); mixin(MIXIN); } struct Struct2 { this(const(Struct1)* ) { } this(ref const(Struct2) ) { } mixin(MIXIN); } ``` The code compiled with DMD 2.095.0, but results in the following error message since DMD 2.095.1: Error: constructor `test.Struct1.this` has no function body with return type inference

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