scala3 -BackTickExamples.scala

import Matrix.`*`

def `1 + 1 == 2 test` = assert(1+1 == 2)  // Readable test names!

def contains(i: Int, seq: Seq[Int]): Boolean = seq match {
  case Nil => false
  case `i` +: _ => true      // Must use back ticks, or i is just a new variable that shadows the method argument.
  case _ +: tail => contains(i, tail)
}

contains(3, Seq(1,2,3))      // true
contains(3, Seq(1,2))        // false

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java.util.Scanner.`match`    // Call a Java method named like a Scala reserved word.
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