Drop debug info in error message

Author: odersky

compiler/src/dotty/tools/dotc/parsing/Scanners.scala

@@ -611,8 +611,7 @@ object Scanners {
           errorButContinue(
             i"""The start of this line does not match any of the previous indentation widths.
                 |Indentation width of current line : $curWidth
-                |This falls between previous widths: ${indent.width} and $lastWidth
-                |Sepregions = $sepRegions / ${getClass}""")
+                |This falls between previous widths: ${indent.width} and $lastWidth""")
         else
           indent = IndentRegion(indent.width, indent.others + curWidth, indent.token, indent.outer)
       }