Try to debug weird error only on CI

Author: smarter

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

@@ -317,8 +317,12 @@ trait TypeAssigner {
     val ownType = fn.tpe.widen match {
       case fntpe: MethodType =>
         if (sameLength(fntpe.paramTypes, args) || ctx.phase.prev.relaxedTyping) fntpe.instantiate(args.tpes)
-        else
+        else {
           errorType(i"wrong number of arguments for $fntpe: ${fn.tpe}, expected: ${fntpe.paramTypes.length}, found: ${args.length}", tree.pos)
+          System.err.println("####DUMP###")
+          Thread.dumpStack
+          System.err.println("~~~DUMP~~~")
+        }
       case t =>
         errorType(i"${err.exprStr(fn)} does not take parameters", tree.pos)
     }