[rb-general] BUILD_PATH_PREFIX_MAP format spec, draft #1

[Ximin Luo]

Daniel Shahaf:
> Ximin Luo wrote on Sat, Jan 21, 2017 at 13:50:00 +0000:
>>   - Decoders in most programming languages decode to a { key -> value list }
>>     rather than a list of pairs as we require, and there is no simple way to
>>     massage this into a list of pairs that still preserves ordering.
> 
> Preserving ordering raises an interesting question: what do we do when
> two key-value pairs have the same key?  Do we leave that undefined, or
> former wins, or latter wins…?
> 
> That's entirely independent of which encoding is chosen.
> [..]

I didn't mention this explicitly but the map_prefix function I wrote would apply the rightmost mapping. This is what GCC does already.

X

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