Files
sx/examples/1000-errors-sets.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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// Error-set declarations + `error.X` tag values + enum-like `==` typing
// (ERR step E1.1). A declared `error { ... }` set is a real type with a u32
// runtime layout; `error.X` is its tag value — the named set when context
// provides one (membership-checked), else the raw global u32 id. Tags compare
// with an `error.X` literal or another error-set value. The rejections live in
// `examples/218-error-set-typing.sx`.
#import "modules/std.sx";
ParseErr :: error { BadDigit, Overflow, Empty }
main :: () -> s32 {
c : ParseErr = error.BadDigit;
d : ParseErr = error.Overflow;
r : s32 = 0;
if c == error.BadDigit { r = r + 1; } // true -> +1
if c == error.Overflow { r = r + 2; } // false
if c == d { r = r + 4; } // false (BadDigit != Overflow)
if d == error.Overflow { r = r + 8; } // true -> +8
tag : u32 = error.Empty; // u32 context -> raw global tag id
if tag != 0 { r = r + 16; } // tag ids are >= 1 -> +16
print("error-set result: {}\n", r); // -> 25
return r;
}