Files
sx/examples/0510-packs-pack-index-oob.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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// Variadic heterogeneous type packs — out-of-bounds pack index
// is a compile-time error.
//
// `foo(..$args) -> $R => args[2]` accesses the third pack
// element. When called with fewer than 3 args, the literal index
// 2 is out of bounds for the pack's actual arity. The compiler
// detects this in `diagPackIndexOOB` and emits a focused
// diagnostic at the index span — pre-fix, the fall-through hit
// the standard slice-indexing path and produced "unresolved
// 'args'" which buried the real cause.
#import "modules/std.sx";
foo :: (..$args) -> $R => args[2];
main :: () -> s32 {
n : s64 = foo(99);
print("{}\n", n);
return 0;
}