Fix tests

Move checker before ExpandSAMs:

- inner classes are more complex to deal with
- the trees are not set for the synthesized class

Author: liufengyun

compiler/src/dotty/tools/dotc/Compiler.scala

@@ -57,6 +57,7 @@ class Compiler {
 
   /** Phases dealing with the transformation from pickled trees to backend trees */
   protected def transformPhases: List[List[Phase]] =
+    List(new init.Checker) ::        // Check initialization of objects
     List(new FirstTransform,         // Some transformations to put trees into a canonical form
          new CheckReentrant,         // Internal use only: Check that compiled program has no data races involving global vars
          new ElimPackagePrefixes,    // Eliminate references to package prefixes in Select nodes
@@ -65,7 +66,6 @@ class Compiler {
          new BetaReduce,             // Reduce closure applications
          new InlineVals,             // Check right hand-sides of an `inline val`s
          new ExpandSAMs) ::          // Expand single abstract method closures to anonymous classes
-    List(new init.Checker) ::        // Check initialization of objects
     List(new ElimRepeated,           // Rewrite vararg parameters and arguments
          new ProtectedAccessors,     // Add accessors for protected members
          new ExtensionMethods,       // Expand methods of value classes with extension methods

compiler/src/dotty/tools/dotc/transform/init/Checker.scala

@@ -29,6 +29,7 @@ class Checker extends Phase {
   private val cycleChecker = new CycleChecker(cache)
 
   override val runsAfter = Set(Pickler.name)
+  val runsBefore = Set(ExpandSAMs.name)
 
   override def isEnabled(using Context): Boolean =
     super.isEnabled && ctx.settings.YcheckInit.value