Error with "|" in the documentation

[TheDeadOne]

steps

1. Open https://www.scala-sbt.org/1.x/docs/Parsing-Input.html#Combining+parsers
2. Copy-paste line val color: Parser[String] = "blue" | "green" in sbt console or in build.sbt

problem

error: value | is not a member of String

expectation

A parser that succeeds if the input is "blue" or "green" as wrote in the documentation.

notes

sbt 1.2.8, 1.6.2
scala 2.12.10

[eed3si9n]

The doc says

The following examples assume the imports:

import sbt._
import complete.DefaultParsers._

[TheDeadOne]

The doc says

The following examples assume the imports:

import sbt._
import complete.DefaultParsers._

Of course I imported them. Otherwise the error would be different.

[SethTisue]

I'm able to reproduce the problem (value | is not a member of String) with the following build.sbt:

import complete.DefaultParsers._
import complete.Parser
val color: Parser[String] = "blue" | "green"

note that I had to add import complete.Parser

(.sbt files don't need explicit import sbt._, I don't think)

I poked around further trying to find a fix but but failed 🤷

[TheDeadOne]

I made a demo https://github.com/TheDeadOne/sbt-issue6955-example