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dictionary - Check if a value is in a list

Does Go have something similar to Python's in keyword? I want to check if a value is in a list.

For example in Python:

x = 'red'

if x in ['red', 'green', 'yellow', 'blue']:
    print "found"
else:
    print "not found"

In Go I've come up with using the set idiom but I don't think it's ideal as I have to specify a int value that I'm not using.

x := "red"

valid := map[string]int{"red": 0, "green": 0,"yellow": 0, "blue": 0}

if _, ok := valid[x]; ok {
    fmt.Println("found")
} else {
    fmt.Println("not found")
}

I understand having an in keyword is probably related to generics. Is there a way to do this using go generate or something?

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