slices: add ContainsFunc function

[GRbit]

Since we have Index, IndexFunc, and Contains functions, it's logical to have ContainsFunc function as well.

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Message from Ian Lance Taylor:

Patch Set 1: Hold+1

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Message from Ian Lance Taylor:

Patch Set 1:

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This PR (HEAD: 8923cee10f65d4f2c58d5d6676eeaf1ef3022a00) has been imported to Gerrit for code review.

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Message from Ian Lance Taylor:

Patch Set 2: -Hold

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Message from Pavel Griaznov:

Patch Set 3:

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Message from Brad Fitzpatrick:

Patch Set 3:

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Message from Ian Lance Taylor:

Patch Set 3:

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Message from Ian Lance Taylor:

Patch Set 3:

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This PR (HEAD: 96a32b365e5b058e86eaf420995ad1342a4de94d) has been imported to Gerrit for code review.

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Message from Pavel Griaznov:

Patch Set 4:

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Message from Ian Lance Taylor:

Patch Set 4:

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This PR (HEAD: b7f6091ee3a33d1234a5cbe8a49e522d1932d580) has been imported to Gerrit for code review.

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Message from Pavel Griaznov:

Patch Set 4:

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Message from Ian Lance Taylor:

Patch Set 5: Run-TryBot+1

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Message from Gopher Robot:

Patch Set 5:

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Message from Gopher Robot:

Patch Set 5:

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Message from Gopher Robot:

Patch Set 5: TryBot-Result-1

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Message from Ian Lance Taylor:

Patch Set 6: Patch Set 5 was rebased

Outdated Votes:

• Run-TryBot+1 (copy condition: "changekind:NO_CODE_CHANGE")
• TryBot-Result-1 (copy condition: "changekind:NO_CODE_CHANGE")

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Message from Ian Lance Taylor:

Patch Set 6: Run-TryBot+1

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Message from Gopher Robot:

Patch Set 6:

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Message from Gopher Robot:

Patch Set 6: TryBot-Result+1

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Message from Ian Lance Taylor:

Patch Set 6: Run-TryBot+1 Auto-Submit+1 Code-Review+2

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Message from Brad Fitzpatrick:

Patch Set 6: Code-Review+2

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This PR is being closed because golang.org/cl/417374 has been merged.