C code tries to initialize nltype with 0 in strange errorhandling / assert / module interaction

[jrfondren]

Bug description

This is a warning with gcc, and an error with tcc. I found it naturally while using nester to test a module that used utf8.codepoint()

Code example

with modcheck.nelua:

require 'errorhandling'
local M = @record{}
local function f() assert(true) return 1 end
local x = f()
function M.f() return f() end
return M

You can observe the error with:

$ nelua -C -i 'require("modcheck")'
warning: using error handling module, it is highly experimental and incomplete!
/home/jfondren/.cache/nelua/eval_2jNUNGZEoYm.c: In function ‘nelua_require_modcheck’:
/home/jfondren/.cache/nelua/eval_2jNUNGZEoYm.c:2205:23: warning: excess elements in struct initializer
 2205 |       return (nltype){0};
      |                       ^
/home/jfondren/.cache/nelua/eval_2jNUNGZEoYm.c:2205:23: note: (near initialization for ‘(anonymous)’)

Where the larger context is

nltype nelua_require_modcheck(nlniltype modname) {
  ({
    int64_t __callret = modcheck_f();
    if(nelua_error_status) {
      return (nltype){0};
    }   
    __callret;
  });
  return NELUA_NIL;
}

Environment

x86_64 linux
Nelua 0.2.0-dev
Build number: 1588
Git date: 2023-09-16 16:20:44 -0300
Git hash: 596fcca
Semantic version: 0.2.0-dev.1588+596fcca5
Copyright (C) 2019-2022 Eduardo Bart (https://nelua.io/)

[edubart]

Error handling module is not finished, it is full of issues. Maybe I should remove from standard library or leave in an experimental folder.

[jrfondren]

I wasn't using 'errorhandling' directly, I was using nester from nelua-batteries.

[edubart]

Fixed in decf713