`return const` parameters make `inout` obsolete

[ketmar via Digitalmars-d]

On Mon, 16 Mar 2015 14:17:57 +0000, Zach the Mystic wrote:

> char* fun(return const char* x);
> 
> Compiler has enough information to adjust the return type of `fun()` to
> that of input `x`. This assumes return parameters have been generalized
> to all reference types. Destroy.

but why compiler has to rewrite return type? i never told it to do that!
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