Backport "Support //> options directive in compilation tests" to LTS (#19167)

Backports #18413 to the LTS branch.

PR submitted by the release tooling.
[skip ci]

Author: Kordyjan

compiler/test/dotty/tools/utils.scala

@@ -80,13 +80,15 @@ def toolArgsFor(tool: ToolName)(lines: List[String]): List[String] =
 // scalac: arg1 arg2, with alternative opening, optional space, alt names, text that is not */ up to end.
 // groups are (name, args)
 private val toolArg = raw"(?://|/\*| \*) ?(?i:(${ToolName.values.mkString("|")})):((?:[^*]|\*(?!/))*)".r.unanchored
+private val directiveOptionsArg = raw"//> using options (.*)".r.unanchored
 
 // Inspect the lines for compiler options of the form
 // `// scalac: args`, `/* scalac: args`, ` * scalac: args`.
 // If args string ends in close comment, stop at the `*` `/`.
 // Returns all the matches by the regex.
 def toolArgsParse(lines: List[String]): List[(String,String)] =
-  lines.flatMap { case toolArg(name, args) => List((name, args)) case _ => Nil }
+  lines.flatMap { case toolArg(name, args) => List((name, args)) case _ => Nil } ++
+  lines.flatMap { case directiveOptionsArg(args) => List(("scalac", args)) case _ => Nil }
 
 import org.junit.Test
 import org.junit.Assert._

tests/explicit-nulls/neg-patmat/match-pat.scala

@@ -1,4 +1,4 @@
-// scalac: -Xfatal-warnings
+//> using options -Xfatal-warnings
 
 class Foo {
 

tests/explicit-nulls/pos/i14682.scala

@@ -1,4 +1,4 @@
-// scalac: -Ysafe-init
+//> using options -Ysafe-init
 
 class C1:
   sealed abstract class Name {

tests/explicit-nulls/pos/i14947.scala

@@ -1,4 +1,4 @@
-// scalac: -Ytest-pickler -Xprint-types
+//> using options -Ytest-pickler -Xprint-types
 
 class B:
   def g: String | Null = ???

tests/explicit-nulls/pos/match-pat.scala

@@ -1,4 +1,4 @@
-// scalac: -Xfatal-warnings
+//> using options -Xfatal-warnings
 
 // Ensure we don't get "the type test for argType cannot be checked at runtime" warning
 

tests/explicit-nulls/pos/unsafe-match-null-pat.scala

@@ -1,4 +1,4 @@
-// scalac: -Xfatal-warnings
+//> using options -Xfatal-warnings
 
 import scala.language.unsafeNulls
 

tests/neg-custom-args/wildcards.scala

@@ -1,4 +1,4 @@
-// scalac: -source future -deprecation -Xfatal-warnings
+//> using options -source future -deprecation -Xfatal-warnings
 
 object Test {
   val xs: List[_] = List(1, 2, 3)  // error

tests/neg-macros/i16355a.scala

@@ -1,4 +1,3 @@
-//> using scala "3.2.1"
 import scala.quoted.Expr
 import scala.quoted.Type
 import scala.quoted.quotes

tests/neg-macros/i9570.scala

@@ -1,4 +1,4 @@
-// scalac: -Xfatal-warnings
+//> using options -Xfatal-warnings
 
 import scala.quoted.*
 

tests/neg-macros/macro-deprecation.scala

@@ -1,4 +1,4 @@
-// scalac: -Xfatal-warnings -deprecation
+//> using options -Xfatal-warnings -deprecation
 
 import scala.quoted.*