[Issue 12454] Return type inference does not work

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12454



--- Comment #1 from Adam D. Ruppe <destructionator at gmail.com> 2014-03-24 13:52:52 PDT ---
D doesn't allow overloading on the return type, only on argument types. The
reason is that it would be difficult to figure out which one you want:

auto a = deduceRetType(); // which one?

int a = 10 + deduceRetType(); // which one?

Those could arguably be ambiguous errors or the second one might say string
doesn't make sense, so use int, but that's not how D works; an expression's
type is always known by looking at the expression itself without considering if
it works in context or not.

(if it doesn't work in context, that's when a compile error for mismatched type
is triggered)

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