Bug 20651 – Document that destructors may not allocate memory

Consider the code from issue 20650: class Foo { ~this() { new int; } } void main() { new Foo; } This runs into core.exception.InvalidMemoryOperationError@src/core/exception.d(647): Invalid memory operation . The reason is that the GC may not be invoked during finalizers, ie. when destructors are run. There is almost never a reason to do this; however, this should still be documented in the language spec at https://dlang.org/spec/class.html#destructors .

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