1 files changed, 29 insertions, 0 deletions
diff --git a/src/dotty/tools/dotc/core/TypeParamInfo.scala b/src/dotty/tools/dotc/core/TypeParamInfo.scala
new file mode 100644
index 000000000..ff3c8fca7
--- /dev/null
+++ b/src/dotty/tools/dotc/core/TypeParamInfo.scala
@@ -0,0 +1,29 @@
+package dotty.tools.dotc.core
+
+import Names.Name
+import Contexts.Context
+import Types.{Type, TypeBounds}
+
+/** A common super trait of Symbol and LambdaParam.
+ *  Used to capture the attributes of type parameters which can be implemented as either.
+ */
+trait TypeParamInfo {
+
+  /** Is this the info of a type parameter? Might be wrong for symbols */
+  def isTypeParam(implicit ctx: Context): Boolean
+
+  /** The name of the type parameter */
+  def paramName(implicit ctx: Context): Name
+
+  /** The info of the type parameter */
+  def paramBounds(implicit ctx: Context): TypeBounds
+
+  /** The info of the type parameter as seen from a prefix type.
+   *  This can be different from `memberInfo` if the binding
+   *  is a type symbol of a class.
+   */
+  def paramBoundsAsSeenFrom(pre: Type)(implicit ctx: Context): TypeBounds
+
+  /** The variance of the type parameter */
+  def paramVariance(implicit ctx: Context): Int
+}
+\ No newline at end of file