Add debug output to track down problem compiling ScalaTest

Author: odersky

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

@@ -10,6 +10,7 @@ import dotty.tools.dotc.core.SymDenotations.ClassDenotation
 import dotty.tools.dotc.core.Symbols._
 import dotty.tools.dotc.transform.SymUtils._
 import util.{NoSource, SourceFile}
+import core.Decorators._
 
 class CompilationUnit protected (val source: SourceFile) {
 
@@ -36,6 +37,7 @@ class CompilationUnit protected (val source: SourceFile) {
 
   def suspend()(given ctx: Context): Nothing =
     if !suspended then
+      println(i"suspended: $this")
       suspended = true
       ctx.run.suspendedUnits += this
     throw CompilationUnit.SuspendException()

compiler/src/dotty/tools/dotc/typer/Inliner.scala

@@ -1243,6 +1243,7 @@ class Inliner(call: tpd.Tree, rhsToInline: tpd.Tree)(implicit ctx: Context) {
       for sym <- dependencies do
         if ctx.compilationUnit.source.file == sym.associatedFile then
           ctx.error(em"Cannot call macro $sym defined in the same source file", body.sourcePos)
+        println(i"suspension triggered by macro call to ${sym.showLocated} in ${sym.associatedFile}")
       ctx.compilationUnit.suspend() // this throws a SuspendException
 
     val evaluatedSplice = Splicer.splice(body, inlinedFrom.sourcePos, MacroClassLoader.fromContext)(ctx1)