Detect when position is not in known source

If the position is outside of the known contents of the source we do not
return any source.

Author: nicolasstucki

compiler/src/scala/quoted/runtime/impl/QuotesImpl.scala

@@ -2816,8 +2816,9 @@ class QuotesImpl private (using val ctx: Context) extends Quotes, QuoteUnpickler
         def startColumn: Int = self.startColumn
         def endColumn: Int = self.endColumn
         def sourceCode: Option[String] =
-          // TODO detect when we do not have a source and return None
-          Some(new String(self.source.content(), self.start, self.end - self.start))
+          val contents = self.source.content()
+          if contents.length < self.end then None
+          else Some(new String(contents, self.start, self.end - self.start))
       end extension
     end PositionMethods
 

tests/run-custom-args/tasty-inspector/i14785.scala

@@ -0,0 +1,33 @@
+
+import scala.quoted.*
+import scala.tasty.inspector.*
+
+@main def Test: Unit = {
+  val classpath = System.getProperty("java.class.path").split(java.io.File.pathSeparatorChar).toList
+  val jar = classOf[dotty.tools.dotc.Compiler].getProtectionDomain.getCodeSource.getLocation.getPath
+  println(classpath)
+  TastyInspector.inspectAllTastyFiles(
+    tastyFiles = Nil,
+    jars = jar :: Nil,
+    dependenciesClasspath = classpath.filter(_.contains("scala3-compiler_3"))
+  )(new MyInspector)
+}
+
+
+class MyInspector extends Inspector {
+  def inspect(using Quotes)(tastys: List[Tasty[quotes.type]]): Unit = {
+      import quotes.reflect.*
+      val traverser = new TreeTraverser {
+        override def traverseTree(tree: Tree)(owner: Symbol): Unit = {
+          tree.pos.sourceCode
+          super.traverseTree(tree)(owner)
+        }
+      }
+
+      tastys.foreach { tasty =>
+        if tasty.path == "dotty/tools/dotc/core/Phases.class" then
+          val tree = tasty.ast
+          traverser.traverseTree(tree)(tree.symbol)
+      }
+    }
+}