Do not warn about expected missing positions in Symbols.pos

Author: jchyb

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

@@ -25,6 +25,7 @@ import scala.quoted.runtime.impl.printers.*
 import scala.reflect.TypeTest
 import dotty.tools.dotc.core.NameKinds.ExceptionBinderName
 import dotty.tools.dotc.transform.TreeChecker
+import dotty.tools.dotc.util.NoSource
 
 object QuotesImpl {
 
@@ -2688,9 +2689,10 @@ class QuotesImpl private (using val ctx: Context) extends Quotes, QuoteUnpickler
           if self.exists then
             val symPos = self.sourcePos
             if symPos.exists then Some(symPos)
-            else
+            else if self.source.exists then
               if xCheckMacro then report.warning(s"Missing symbol position (defaulting to position 0): $self\nThis is a compiler bug. Please report it.")
               Some(self.source.atSpan(dotc.util.Spans.Span(0)))
+            else None
           else None
 
         def docstring: Option[String] =

tests/neg-macros/i19842-b.check

@@ -9,8 +9,8 @@
   |
   |	at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
   |	at dotty.tools.dotc.transform.TreeChecker$.checkParents(TreeChecker.scala:210)
+  |	at scala.quoted.runtime.impl.QuotesImpl$reflect$ClassDef$.module(QuotesImpl.scala:258)
   |	at scala.quoted.runtime.impl.QuotesImpl$reflect$ClassDef$.module(QuotesImpl.scala:257)
-  |	at scala.quoted.runtime.impl.QuotesImpl$reflect$ClassDef$.module(QuotesImpl.scala:256)
   |	at Macros$.makeSerializer(Macro.scala:27)
   |
   |---------------------------------------------------------------------------------------------------------------------

tests/pos-macros/i21672/Macro_1.scala

@@ -0,0 +1,10 @@
+object Repro {
+  inline def apply(): Unit = ${ applyImpl }
+
+  import scala.quoted.*
+  def applyImpl(using q: Quotes): Expr[Unit] = {
+   import q.reflect.*
+   report.info(TypeRepr.of[Some[String]].typeSymbol.pos.toString)
+   '{ () }
+  }
+}

tests/pos-macros/i21672/Test_2.scala

@@ -0,0 +1,3 @@
+//> using options -Xfatal-warnings
+object Test:
+  Repro()