Hoisting out commonly used values into util.common

... because this cuts down on object creations. Also, some polishings in Denotations.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/dotty/tools/dotc/util/common.scala b/src/dotty/tools/dotc/util/common.scala
new file mode 100644
index 000000000..5f133b079
--- /dev/null
+++ b/src/dotty/tools/dotc/util/common.scala
@@ -0,0 +1,16 @@
+package dotty.tools.dotc
+package util
+
+import core.Names.Name
+import core.Types.WildcardType
+
+/** Common values hoisted out for performance */
+object common {
+
+  val emptyDNF = (Nil, Set[Name]()) :: Nil
+
+  val alwaysTrue = Function.const(true) _
+  val alwaysZero = Function.const(0) _
+  val alwaysWildcardType = Function.const(WildcardType) _
+
+}
\ No newline at end of file