Provide context to SourceFile in scaldoc

Author: mbovel

scaladoc/src/dotty/tools/scaladoc/site/templates.scala

@@ -80,7 +80,8 @@ case class TemplateFile(
     lazy val snippetCheckingFunc: SnippetChecker.SnippetCheckingFunc =
       val path = Some(Paths.get(file.getAbsolutePath))
       val pathBasedArg = ssctx.snippetCompilerArgs.get(path)
-      val sourceFile = dotty.tools.dotc.util.SourceFile(dotty.tools.io.AbstractFile.getFile(path.get), scala.io.Codec.UTF8)
+      val initDottyContext = (new dotty.tools.dotc.core.Contexts.ContextBase).initialCtx
+      val sourceFile = dotty.tools.dotc.util.SourceFile(dotty.tools.io.AbstractFile.getFile(path.get), scala.io.Codec.UTF8)(using initDottyContext)
       (str: String, lineOffset: SnippetChecker.LineOffset, argOverride: Option[SCFlags]) => {
           val arg = argOverride.fold(pathBasedArg)(pathBasedArg.overrideFlag(_))
           val compilerData = SnippetCompilerData(