e898effb4b
Extends the failable-main entry-point wrapper to a value-carrying main.
`main :: () -> (int, !)` now exits the integer value on success (truncated
to u8, like a plain integer main) and reports the header + trace to stderr
+ exits 1 on an escaping error (same reporter as the pure `-> !` form).
- lower.zig validateMainSignature: accept a 2-field `{int, error_set}`
tuple return (set needs_trace_runtime) instead of rejecting it. Multi-
value `-> (T1, T2, !)` and non-integer value slots still reject — there's
no single integer exit code to map them to (sharpened diagnostic).
- emit_llvm.zig: the `.ret` arm detects a value-carrying main (tuple ending
in `.error_set`) and extracts `{value, tag}` (extractvalue 0/1) before
calling emitFailableMainRet, now generalized to take an optional `value`
(null → pure `-> !`, success exits 0; present → success exits the value).
C reporter unchanged.
All E4.2 entry-point shapes (void / int / `-> !` / `-> (int, !)`) now done.
examples/245-failable-main-value.sx (exit 64); 239 comment refreshed.
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2 lines
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