diff --git a/compiler/ast/ast_types.nim b/compiler/ast/ast_types.nim
index f8059e77699..86be02e8ffa 100644
--- a/compiler/ast/ast_types.nim
+++ b/compiler/ast/ast_types.nim
@@ -245,7 +245,9 @@ type
 
 const
   nkUIntLiterals*  = {nkCharLit, nkUIntLit..nkUInt64Lit}
+    ## Unsigned int literals
   nkSIntLiterals*  = {nkIntLit..nkInt64Lit}
+    ## Signed int literals
   nkIntLiterals*   = nkUIntLiterals + nkSIntLiterals
   nkFloatLiterals* = {nkFloatLit..nkFloat64Lit}
   nkStrLiterals*   = {nkStrLit..nkTripleStrLit}
diff --git a/compiler/ast/filters.nim b/compiler/ast/filters.nim
index cf1a0f0d89e..06548cbae15 100644
--- a/compiler/ast/filters.nim
+++ b/compiler/ast/filters.nim
@@ -38,7 +38,7 @@ proc invalidPragma(conf: ConfigRef; n: PNode) =
 proc getArg(conf: ConfigRef; n: PNode, name: string, pos: int): PNode =
   result = nil
   case n.kind
-  of nkWithoutSons: return
+  of nkWithoutSons: discard # these can't have args
   of nkWithSons:
     for i in 1..<n.len:
       if n[i].kind == nkExprEqExpr: