enh(scala) add missing enum, export and given keywords

These keywords were added in Scala 3.
See https://docs.scala-lang.org/scala3/reference/syntax.html#regular-keywords

CHANGES.md

@@ -16,6 +16,7 @@ Grammars:
 - enh(css/less/stylus/scss) add support for CSS Grid properties [monochromer][]
 - enh(java) add support for Java Text Block (#3322) [Teletha][]
 - enh(scala) add missing `do` and `then` keyword (#3323) [Nicolas Stucki][]
+- enh(scala) add missing `enum`, `export` and `given` keywords (#3328) [Nicolas Stucki][]
 
 [Austin Schick]: https://github.com/austin-schick
 [Josh Goebel]: https://github.com/joshgoebel

src/languages/scala.js

@@ -121,7 +121,7 @@ export default function(hljs) {
     name: 'Scala',
     keywords: {
       literal: 'true false null',
-      keyword: 'type yield lazy override def with val var sealed abstract private trait object if then forSome for while do throw finally protected extends import final return else break new catch super class case package default try this match continue throws implicit'
+      keyword: 'type yield lazy override def with val var sealed abstract private trait object if then forSome for while do throw finally protected extends import final return else break new catch super class case package default try this match continue throws implicit export enum given'
     },
     contains: [
       hljs.C_LINE_COMMENT_MODE,

test/markup/scala/enum.expect.txt

@@ -0,0 +1,6 @@
+<span class="hljs-keyword">enum</span> <span class="hljs-type">Color</span>:
+  <span class="hljs-keyword">case</span> <span class="hljs-type">Red</span>, <span class="hljs-type">Green</span>, <span class="hljs-type">Blue</span>
+
+<span class="hljs-keyword">enum</span> <span class="hljs-type">State</span>:
+  <span class="hljs-keyword">case</span> <span class="hljs-type">On</span>
+  <span class="hljs-keyword">case</span> <span class="hljs-type">Off</span>

test/markup/scala/enum.txt

@@ -0,0 +1,6 @@
+enum Color:
+  case Red, Green, Blue
+
+enum State:
+  case On
+  case Off

test/markup/scala/export.expect.txt

@@ -0,0 +1,2 @@
+<span class="hljs-keyword">export</span> scanUnit.scan
+<span class="hljs-keyword">export</span> printUnit.{status =&gt; _, *}

test/markup/scala/export.txt

@@ -0,0 +1,2 @@
+export scanUnit.scan
+export printUnit.{status => _, *}

test/markup/scala/given.expect.txt

@@ -0,0 +1,2 @@
+<span class="hljs-keyword">given</span> <span class="hljs-type">T</span> = ???
+<span class="hljs-keyword">given</span> x: <span class="hljs-type">T</span> = ???

test/markup/scala/given.txt

@@ -0,0 +1,2 @@
+given T = ???
+given x: T = ???