1 files changed, 12 insertions, 4 deletions
diff --git a/src/dotty/tools/dotc/reporting/diagnostic/tpe.scala b/src/dotty/tools/dotc/reporting/diagnostic/tpe.scala
index 4aa24c440..ee221f80d 100644
--- a/src/dotty/tools/dotc/reporting/diagnostic/tpe.scala
+++ b/src/dotty/tools/dotc/reporting/diagnostic/tpe.scala
@@ -4,7 +4,7 @@ package reporting
 package diagnostic
 
 import dotc.core._
-import Contexts.Context, Decorators._, Symbols._
+import Contexts.Context, Decorators._, Symbols._, Names._
 import dotc.printing.SyntaxHighlighting._
 import util.{SourcePosition, NoSourcePosition}
 
@@ -35,13 +35,21 @@ object tpe {
 
       val caseDef = s"case $pat$guard => $body"
 
-      hl"""|Explanation
-           |===========
-           |For each ${"case"} bound variable names  have to be unique. In:
+      hl"""|For each ${"case"} bound variable names  have to be unique. In:
            |
            |$caseDef
            |
            |`${bind.name}` is not unique. Rename one of the bound variables!""".stripMargin
     }
   }
+
+  class MissingIdent(tree: untpd.Ident, treeKind: String, name: Name)(implicit ctx: Context) extends MessageCreator {
+    val kind = "Missing identifier"
+    val msg = em"not found: $treeKind$name"
+
+    val explanation = {
+      hl"""|An identifier for `${name.show}` is missing. This means that something
+           |has either been misspelt or you're forgetting an import""".stripMargin
+    }
+  }
 }