IC: further progress (#17150)

* IC: respect the -f switch

* IC: better rod file inspection

* progress

lib/system/excpt.nim

@@ -378,7 +378,6 @@ proc reportUnhandledErrorAux(e: ref Exception) {.nodestroy.} =
     # ugly, but avoids heap allocations :-)
     template xadd(buf, s, slen) =
       if L + slen < high(buf):
-
         copyMem(addr(buf[L]), (when s is cstring: s else: cstring(s)), slen)
         inc L, slen
     template add(buf, s) =
@@ -404,8 +403,6 @@ proc reportUnhandledError(e: ref Exception) {.nodestroy.} =
     unhandledExceptionHook(e)
   when hostOS != "any":
     reportUnhandledErrorAux(e)
-  else:
-    discard ()
 
 proc nimLeaveFinally() {.compilerRtl.} =
   when defined(cpp) and not defined(noCppExceptions) and not gotoBasedExceptions: