The lit/match appends went through a let-temp; the direct Hare
spelling append(insts, (r: inst_lit)) compiles and runs correctly
(probed at the real 48B-payload inst shape), so the temps were an
undocumented reshape. Void variants (skip/any) keep the typed let —
a bare type name is a symbol ref in ww — now documented at-site.
The bare-slice-decl zeroing cite pointed at shlex.ww:215, which
zeroes its header EXPLICITLY and so proves nothing; the real
mechanism is cgen.c:9836's no-rhs multi-word composite zero-fill.
Ports ref/hare/regex/regex.ha:227-263 literal arms: leading unanchored
inst_skip, inst_lit / inst_any, epilogue inst_match(false). Every
deferred metacharacter arm returns a loud not-yet-ported error (the
fold boundary); state serving only deferred arms drops with them.
Hare free()/defer-if cleanup omitted (no-free runtime, #27); bare
append per #36. 4 new @test rows pin the emitted programs incl. the
empty-input and loud-boundary cases; compile()'s >24B tagged return
doubles as a #38 sret consumer. Rides #34/#38/#44/#45/#48 — all five
fold-2a blockers now closed on master.
Port of ref/hare/regex/regex.ha fold 1 (the data model). Lands the
full type model — error, the inst_* variants + 10-variant inst union
(the nominally-distinct same-underlying size/void aliases included),
result/capture, charset + items, the regex struct — plus finish().
Test 989_regex_run pins variant discrimination, payload extraction,
struct shapes, and finish() on cstage; w6c == w6c_ww byte-identical.
Two fold-1 constructs are held back behind filed compiler/fidelity
gaps, documented at their sites (regex tasks A–D):
- charclass_map (regex.ha:74-87): const [](str, *fn(rune) bool)
table — blocked on the array-literal->slice element-coercion
checker gap (type.c:402-404 #258 borrow uses exact type_eq,
no element decay). It needs `import ascii;`, so both land with
the consuming fold (compile) once the gap is fixed.
- finish() free()s; ww is a no-free runtime (rt/alloc.s:30), so the
faithful body drops the frees, as the port drops every Hare
free(). Kept as a no-op for API parity.
DEFERRED to later folds: compile()/exec/find/replace.
