a049e2940c
The consumer side of the error-channel tuple ABI. A value-carrying `-> (T, !E)`
failable can now be consumed by `try` and `catch` (not just destructured).
Single-value; multi-value `-> (T1, T2, !)` consumers bail (E2).
- lowerTry: a value-carrying callee returns `{v, err}`. Extract `err`
(tuple_get field 1), branch; on success the try value is `tuple_get(field 0)`,
on error propagate via emitErrorReturn (pure caller → `ret(tag)`;
value-carrying caller → `ret {undef..., tag}`). Widening now runs for
value-carrying callees too. Retires the two value-carrying bails.
- lowerCatch: a value-carrying LHS merges through a block-param phi — the
success edge feeds `tuple_get(field 0)`, the handler edge feeds the body's
value (coerced to the success type). runCatchBody factors the bound-tag body
lowering (force_block_value for the value case). Pure-failable catch
unchanged.
- A non-diverging value-carrying catch body that yields no value is now a
clean diagnostic ("`catch` body must produce a value … or diverge") instead
of coercing `void` into a bad ref / failing LLVM verification — caught by an
adversarial review of the lowering.
Tests: examples/229-value-failable-consume.sx (try in value-carrying + pure
callers, catch block/bare/match-body/diverging bodies; exit 32),
examples/230-value-failable-reject.sx (void catch body rejected; exit 1).
Gates: zig build, zig build test, 268/268 examples.
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