bugfix: Fix possible SuspendException thrown when using macros

Fixes scalameta/metals#7872

[Cherry-picked 3dfa5ee]

Author: tgodzik

compiler/src/dotty/tools/dotc/interactive/Completion.scala

@@ -591,12 +591,15 @@ object Completion:
         case _: MethodOrPoly => tpe
         case _ => ExprType(tpe)
 
+      // Try added due to https://github.com/scalameta/metals/issues/7872
       def tryApplyingReceiverToExtension(termRef: TermRef): Option[SingleDenotation] =
-        ctx.typer.tryApplyingExtensionMethod(termRef, qual)
-          .map { tree =>
-            val tpe = asDefLikeType(tree.typeOpt.dealias)
-            termRef.denot.asSingleDenotation.mapInfo(_ => tpe)
-          }
+        try
+          ctx.typer.tryApplyingExtensionMethod(termRef, qual)
+            .map { tree =>
+             val tpe = asDefLikeType(tree.typeOpt.dealias)
+              termRef.denot.asSingleDenotation.mapInfo(_ => tpe)
+            }
+        catch case NonFatal(_) => None
 
       def extractMemberExtensionMethods(types: Seq[Type]): Seq[(TermRef, TermName)] =
         object DenotWithMatchingName:
@@ -694,13 +697,13 @@ object Completion:
      * @param qual The argument to which the implicit conversion should be applied.
      * @return The set of types after `qual` implicit conversion.
      */
-    private def implicitConversionTargets(qual: tpd.Tree)(using Context): Set[SearchSuccess] = {
+    private def implicitConversionTargets(qual: tpd.Tree)(using Context): Set[SearchSuccess] = try {
       val typer = ctx.typer
       val conversions = new typer.ImplicitSearch(defn.AnyType, qual, pos.span, Set.empty).allImplicits
 
       interactiv.println(i"implicit conversion targets considered: ${conversions.toList}%, %")
       conversions
-    }
+    } catch case NonFatal(_) => Set.empty
 
     /** Filter for names that should appear when looking for completions. */
     private object completionsFilter extends NameFilter: