Files
sx/examples/1027-errors-failable-main-value.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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// Value-carrying failable main `-> (int, !)` (ERR step E4.2). The entry-point
// wrapper extracts the `{value, error}` tuple main returns: on success it exits
// with the integer value (truncated to u8, like a plain integer main); on an
// escaping error it prints the header + trace to stderr and exits 1 (the same
// reporter as the pure `-> !` form — see 244). This run takes the success path.
// Expected exit code: 64 (the returned value).
#import "modules/std.sx";
ParseErr :: error { Empty, BadDigit };
inner :: (n: s32) -> (s32, !ParseErr) {
if n == 0 { raise error.Empty; }
if n < 0 { raise error.BadDigit; }
return n * 2;
}
main :: () -> (s32, !ParseErr) {
v := try inner(32); // succeeds → v = 64
print("v = {}\n", v);
return v; // success → exit code 64
}