Tidy up isOrdinalType

1 files changed, 5 insertions, 4 deletions

diff --git a/compiler/types.nim b/compiler/types.nim
index c56382b89..442db8ec9 100644
--- a/compiler/types.nim
+++ b/compiler/types.nim
@@ -148,10 +148,11 @@ proc skipGeneric(t: PType): PType =
 
 proc isOrdinalType(t: PType): bool =
   assert(t != nil)
-  # caution: uint, uint64 are no ordinal types!
-  result = t.kind in {tyChar,tyInt..tyInt64,tyUInt8..tyUInt32,tyBool,tyEnum} or
-      (t.kind in {tyRange, tyOrdinal, tyConst, tyMutable, tyGenericInst}) and
-       isOrdinalType(t.sons[0])
+  const
+    # caution: uint, uint64 are no ordinal types!
+    baseKinds = {tyChar,tyInt..tyInt64,tyUInt8..tyUInt32,tyBool,tyEnum}
+    parentKinds = {tyRange, tyOrdinal, tyConst, tyMutable, tyGenericInst}
+  t.kind in baseKinds or (t.kind in parentKinds and isOrdinalType(t.sons[0]))
 
 proc enumHasHoles(t: PType): bool =
   var b = t