Drop the ':' before captures (for xs (x) / for 0..n (i)); the index
capture becomes the trailing open range (for xs, 0.. (x, i)). 136
headers across 26 files, mechanical.
Five headless tests (banner_layout, hit_test, swipe_commit,
swipe_intent, swipe_reshuffle) also gain a direct
#import "modules/ui/types.sx" — they named Point/Frame through a
transitive import, which bare visibility no longer permits.
Gates: sx build --target ios-sim main.sx links; tools/run_tests.sh
23/23.
find_matches walked maximal same-type spans without excluding `.empty`, so a
line of 3+ holes (left by a prior clear) was reported as a match. After any
vertical 3-clear or L/T clear the board carries such a line, so find_matches /
clear_matches returned non-zero on a board with no real gem match — which would
prevent the P2.4 cascade from ever stabilising.
Fix at the source: a run is only a match if its gem type is not `.empty`. Holes
already break runs of real gems (a hole differs from every gem), so this is the
only change needed and every caller (P1.3 legality, P2.4 cascade) is now correct.
Regression in tests/clear.sx: a holes-only board yields zero matches and
clear_matches 0, and re-clearing a holed board returns 0. Other goldens are
unchanged (no board without holes is affected).
Add the first resolution-pipeline step to the headless board model.
- Introduce an `empty` hole sentinel on the Gem enum (ordinal 6, outside
GEM_COUNT so the RNG/pick_gem never draw it). board_dump renders holes as
EMPTY_CHAR ('.') via a single branch in gem_char, leaving boards without
holes byte-identical to before (existing goldens unchanged).
- clear_cells(board, mask): set every matched cell to `.empty`, leave all
others untouched, return the count cleared.
- clear_matches(board): detect+clear in one call; returns 0 (board unchanged)
when there are no matches.
No gravity or refill yet (P2.2 / P2.3).
tests/clear.sx applies detect->clear to hand-crafted boards (single
horizontal/vertical runs, disjoint runs, an overlapping L/T whose shared cell
clears once, and a no-match checkerboard), snapshots before/after, and asserts
matched cells became holes, non-matched cells are unchanged, and the cleared
count is exact. Locked as tests/expected/clear.{stdout,exit}.
