Handle missing source code

Author: liufengyun

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

@@ -263,6 +263,8 @@ class Objects {
 
         case ClassAbs(klass) =>
           val target = if needResolve then resolve(klass, field) else field
+          if !target.hasSource then return Result(Bottom, Nil)
+
           val trace1 = trace.add(source)
           if target.is(Flags.Lazy) then
             given Trace = trace1
@@ -274,6 +276,8 @@ class Objects {
 
         case addr: Addr =>
           val target = if needResolve then resolve(addr.klass, field) else field
+          if !target.hasSource then return Result(Bottom, Nil)
+
           val trace1 = trace.add(source)
           if target.is(Flags.Lazy) then
             given Trace = trace1
@@ -290,11 +294,9 @@ class Objects {
               //
               // return `Bottom` here, errors are reported in checking `ThisRef`
               Result(Bottom, Nil)
-            else if target.hasSource then
+            else
               val rhs = target.defTree.asInstanceOf[ValOrDefDef].rhs
               eval(rhs, addr, target.owner.asClass, cacheResult = true)
-            else
-              Result(Bottom, Nil)
 
         case _: Fun =>
           ???