fix #20253 (#21174)

* fix #20253

* change NimbleStableCommit

* Update koch.nim

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>

compiler/sempass2.nim

@@ -1488,7 +1488,10 @@ proc trackProc*(c: PContext; s: PSym, body: PNode) =
      s.kind in {skProc, skFunc, skConverter, skMethod} and s.magic == mNone:
     var res = s.ast[resultPos].sym # get result symbol
     if res.id notin t.init:
-      message(g.config, body.info, warnProveInit, "result")
+      if tfRequiresInit in s.typ[0].flags:
+        localError(g.config, body.info, "'$1' requires explicit initialization" % "result")
+      else:
+        message(g.config, body.info, warnProveInit, "result")
   let p = s.ast[pragmasPos]
   let raisesSpec = effectSpec(p, wRaises)
   if not isNil(raisesSpec):

tests/misc/t20253.nim

@@ -0,0 +1,10 @@
+discard """
+  errormsg: "'result' requires explicit initialization"
+  line: 10
+"""
+
+type Meow {.requiresInit.} = object 
+  init: bool
+
+proc initMeow(): Meow =
+  discard