More informative asserts.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/dotty/tools/dotc/core/Symbols.scala b/src/dotty/tools/dotc/core/Symbols.scala
index 5bba99c9c..408142ede 100644
--- a/src/dotty/tools/dotc/core/Symbols.scala
+++ b/src/dotty/tools/dotc/core/Symbols.scala
@@ -355,8 +355,8 @@ object Symbols {
     final def isType(implicit ctx: Context): Boolean = denot.isType
     final def isClass: Boolean = isInstanceOf[ClassSymbol]
 
-    final def asTerm(implicit ctx: Context): TermSymbol = { assert(isTerm); asInstanceOf[TermSymbol] }
-    final def asType(implicit ctx: Context): TypeSymbol = { assert(isType); asInstanceOf[TypeSymbol] }
+    final def asTerm(implicit ctx: Context): TermSymbol = { assert(isTerm, s"asTerm called on not-a-Term $this" ); asInstanceOf[TermSymbol] }
+    final def asType(implicit ctx: Context): TypeSymbol = { assert(isType, s"isType called on not-a-Type $this"); asInstanceOf[TypeSymbol] }
     final def asClass: ClassSymbol = asInstanceOf[ClassSymbol]
 
     /** A unique, densely packed integer tag for each class symbol, -1
@@ -367,7 +367,7 @@ object Symbols {
 
     /** This symbol entered into owner's scope (owner must be a class). */
     final def entered(implicit ctx: Context): this.type = {
-      assert(this.owner.isClass) // !!! DEBUG
+      assert(this.owner.isClass, s"symbol ($this) entered the scope of non-class owner ${this.owner}") // !!! DEBUG
       this.owner.asClass.enter(this)
       if (this is Module) this.owner.asClass.enter(this.moduleClass)
       this