Bug 20504 – grammar allows missing function body for AutoFuncDeclaration

This does not compile: ``` void foo()() { nothrow bar() {} // allowed nothrow bar(); // should parse according to spec } ``` The spec says that in an AutoFuncDeclaration a MissingFunctionBody is allowed, yet even before instantiating template foo it raises an error: Error: function declaration without return type. I suggest only allowing SpecifiedFunctionBody in an AutoFuncDeclaration since it would always be a semantic error anyways (you can't infer the return type without a function body). https://dlang.org/spec/grammar.html#AutoFuncDeclaration https://dlang.org/spec/grammar.html#FunctionBody

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