[PATCH] Add [[nodiscard]] attribute to C++17 components

[Jonathan Wakely]

On 23/11/17 22:40 +0000, Jonathan Wakely wrote:
>C++17 added the [[nodiscard]] attribute, similar to GCC's
>warn_unused_result. The C++2a draft requires it to be used in several
>places. This patch adds it where required on components which are new
>to C++17, which are still experimental and so I'm changing them in
>stage 3.

I missed one of the C++17 pieces that should have [[nodiscard]].

Tested powerpc64le-linux, committed to trunk.


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