[PATCH 2 of 2] revset: introduce new operator "##" to concatenate strings/symbols at runtime

[Matt Mackall]

On Mon, 2015-01-05 at 11:05 +0900, FUJIWARA Katsunori wrote:
>   - have lower priority than any other prefix, infix and postfix operators
> 
>       good: ("dead" ## "beef") or ("feed" ## "face")
> 
>       bad:   "dead" ## "beef"  or  "feed" ## "face"
>            => means "dead" ## ("beef"  or  "feed") ## "face",
>               and causes syntax error

Um.. why? In C, it's obviously got very high effective precedence,
because it happens in the preprocessor before any of the real operators
are considered.

I queued the first patch for default, thanks.

-- 
Mathematics is the supreme nostalgia of our time.