Bug 14545 – can't deprecate default construction

cat > enh.d << CODE struct Foo { deprecated("use foo() instead") this(); } CODE dmd -c enh ---- Error: constructor enh.Foo.this default constructor for structs only allowed with @disable and no body ---- There is no mean to deprecate default construction of a struct before finally disabling it. We should enhance the compiler so that the above declaration is valid and using `Foo foo;` would emit a deprecation warning.

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