Fix #15599 (#15601)

* Fix #15599

* Add test

compiler/semmagic.nim

@@ -527,7 +527,7 @@ proc magicsAfterOverloadResolution(c: PContext, n: PNode,
     if n[^1].kind == nkSym and n[^1].sym.kind notin {skProc, skFunc}:
       localError(c.config, n.info, "finalizer must be a direct reference to a proc")
     elif optTinyRtti in c.config.globalOptions:
-      let fin = if n[^1].kind == nkLambda: n[^1][namePos].sym
+      let fin = if n[^1].kind in {nkLambda, nkDo}: n[^1][namePos].sym
                 else: n[^1].sym
       # check if we converted this finalizer into a destructor already:
       let t = whereToBindTypeHook(c, fin.typ[1].skipTypes(abstractInst+{tyRef}))

tests/arc/tarcmisc.nim

@@ -26,6 +26,7 @@ new line after - @['a']
 finalizer
 aaaaa
 hello
+ok
 closed
 destroying variable: 20
 destroying variable: 10
@@ -378,3 +379,14 @@ proc text_parser(xml: var XmlParser) =
 
 text_parser(xml)
 text_parser(xml2)
+
+# bug #15599
+type
+  PixelBuffer = ref object
+
+proc newPixelBuffer(): PixelBuffer =
+  new(result) do (buffer: PixelBuffer):
+    echo "ok"
+
+discard newPixelBuffer()
+