Files
sx/examples/1022-errors-main-signature-reject.sx
agra 4e942b5373 test: migrate examples to XXXX-category-name layout + split expected streams
Rename all example tests/companions to the XXXX-category-test-name scheme
(per-category 100-blocks: basic 0010, types 0100, ... errors 1000,
diagnostics 1100, ffi 1200, ffi-objc 1300, ffi-jni 1400, vectors 1500,
platform 1600). Companions and dir/C fixtures move in lockstep with their
parent test; #import/#source/#include paths rewritten to match.

Expected output now lives in examples/expected/ (a sibling dir of the
tests) split into three streams per the new convention:
  <name>.exit / <name>.stdout / <name>.stderr  (+ optional <name>.ir)

run_examples.sh rewritten: scans examples/ and issues/ for an
expected/<name>.exit marker, captures stdout and stderr separately (no
more 2>&1), compares each stream + exit + optional IR snapshot.

Behavior validated unchanged: every renamed test reproduces its prior
merged output + exit (diffs limited to file paths/basenames embedded in
diagnostics + traces, which correctly reflect the new names). Suite:
292 passed, 0 failed. 50-smoke.sx split + issue relocation + docs follow
in subsequent commits.
2026-06-01 19:05:15 +03:00

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// Entry-point signature gate (ERR step E4.2). `main` must take no parameters
// and have one of: void, an integer (POSIX exit code), `-> !` (failable, no
// value), or `-> (int, !)` (failable + integer exit code). Anything else is a
// clean diagnostic — previously `main :: () -> string` SEGFAULTED (the JIT
// calls main as `() -> i32`, so a string return is read as garbage). Accepted
// shapes are exercised elsewhere (238 integer-exit truncation, 244 `-> !`,
// 245 `-> (int, !)`). This file is expected to FAIL compilation (exit 1).
//
// Run: ./zig-out/bin/sx run examples/239-main-signature-reject.sx
#import "modules/std.sx";
main :: () -> string { // ERROR: return type must be void, an integer, or `!`
return "not an exit code";
}