`{.push ... .}` pragma stack usage leak with `isErrOr` and `isOkOr`

[tersec]

Maybe other callables too.

import results

{.push raises: [].}

proc r() =
  default(Result[int, int]).isErrOr:
    discard

{.pop.}

import std/os
proc n() = createDir("")

For example.

This is happening with at least

Nim Compiler Version 2.0.14 [Linux: amd64]
Compiled at 2025-03-10
Copyright (c) 2006-2023 by Andreas Rumpf

git hash: bf4de6a394e040d9810cba8c69fb2829ff04dcc6
active boot switches: -d:release

The issue is that these templates under certain conditions:

nim-results/results.nim

Lines 1353 to 1354 in df8113d

	when pushGenericsOpenSym:
	{.push experimental: "genericsOpenSym".}

which means that the {.pop.} in the example above does not pop {.push raises: [].} but rather this {.push experimental: "genericsOpenSym".}

[tersec]

An example of what's happening:

{.push raises: [].}

proc h() =
  {.push raises: [CatchableError].}

{.pop.}

import std/os
proc f() = createDir("")