Rename matcher Contains

[povilasb]

I'd like to bring the original issue again: ujh#45
I made a PR for it: ujh#50
Would you be interested in merging? :)

[Valloric]

Thanks for interest in contributing! :)

This seems like it might not be worth breaking backwards compatibility for. I have a rather draconian view against API breakage which is basically never, ever break it unless absolutely necessary. This doesn't seem to pass that bar for me, sorry.

Ideally we'd be able to find a way that contains can take both a single item and a vector for multiple items. This might be doable (not sure) by making the param take a special type that can be auto-converted from both a vec of Ts and a single T. @jwilm You know rust better than I do; is this doable?

[jwilm]

Something like this might work depending on how the contains API is used in practice. There is a type inference issue that you can see by removing the hint in main. If it doesn't break the test suite, then maybe it's fine?

[Valloric]

@jwilm I like this! I'd go with "if it doesn't break the test suite, it should be good."

@povilasb If you sent a PR with the implementation that @jwilm provided a prototype of, that would have a high chance of being merged.

[povilasb]

Okey, I might make some spare time this week ;)