Fixes #25202 (#25244)

(cherry picked from commit 7af4e3eefd)

lib/system/embedded.nim

@@ -24,6 +24,7 @@ when not gotoBasedExceptions:
   proc popSafePoint {.compilerRtl, inl.} = discard
 proc pushCurrentException(e: ref Exception) {.compilerRtl, inl.} = discard
 proc popCurrentException {.compilerRtl, inl.} = discard
+proc closureIterSetExc(e: ref Exception) {.compilerRtl, inl.} = discard
 
 # some platforms have native support for stack traces:
 const

lib/system/excpt.nim

@@ -159,6 +159,9 @@ proc popCurrentException {.compilerRtl, inl.} =
   currException = currException.up
   #showErrorMessage2 "B"
 
+proc closureIterSetExc(e: ref Exception) {.compilerRtl, inl.} =
+  currException = e
+
 proc popCurrentExceptionEx(id: uint) {.compilerRtl.} =
   discard "only for bootstrapping compatbility"
 

lib/system/jssys.nim

@@ -72,6 +72,9 @@ proc getCurrentExceptionMsg*(): string =
 proc setCurrentException*(exc: ref Exception) =
   lastJSError = cast[PJSError](exc)
 
+proc closureIterSetExc(e: ref Exception) {.compilerRtl, benign.} =
+  setCurrentException(e)
+
 proc pushCurrentException(e: sink(ref Exception)) {.compilerRtl, inline.} =
   ## Used to set up exception handling for closure iterators.