Cooled magma is ordinary rock: visible in the smooth look and drillable

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/t_drill.js

@@ -139,4 +139,36 @@ run('for (let y = 80; y < 100; y++) for (let x = 120; x < 122; x++) bgm[y * W +
 hold(121, 92, 1, 0, 3);
 check('a tree trunk in the path is cut into wood chunks', count(run, run('LWOOD')) > 0, count(run, run('LWOOD')));
 
+// Melts that cool loose in the world (magma from the bag, metal spilled outside a mold) are
+// ordinary solids the drill can break; built walls, slope corner cells and molds stay protected.
+flatWorld(run, 160, 128, 120);
+const melt = run(`(() => {
+  player.bitTier = BIT_TIERS.length - 1; bot.x = 60; bot.y = 60;
+  for (let y = 80; y < 88; y++) for (let x = 60; x < 72; x++) setCell(y * W + x, MAGMA, 1250, 0);
+  for (let k = 0; k < 2400; k++) simTick();
+  for (let x = 90; x < 96; x++) setCell(110 * W + x, COPPER, 20, F_CAST); // metal that set outside a mold
+  let bas = 0, nat = 0, cu = 0, drillable = 0, cuDrill = 0;
+  for (let i = 0; i < N; i++) {
+    if (mat[i] === BASALT) { bas++; if (flags[i] & F_NAT) nat++; if (crumbly(i)) drillable++; }
+    if (mat[i] === COPPER) { cu++; if (crumbly(i)) cuDrill++; }
+  }
+  return { bas, nat, drillable, cu, cuDrill };
+})()`);
+check('magma from the bag cools into natural basalt', melt.bas > 0 && melt.nat === melt.bas, JSON.stringify(melt));
+check('that basalt can be drilled', melt.drillable === melt.bas, JSON.stringify(melt));
+check('copper that set outside a mold can be drilled for scrap', melt.cu > 0 && melt.cuDrill === melt.cu, JSON.stringify(melt));
+check('basalt already stuck without the natural mark can be drilled too',
+  run('(() => { setCell(20 * W + 20, BASALT, 20, 0); player.bitTier = BIT_TIERS.length - 1; return crumbly(20 * W + 20); })()'));
+check('built walls and slope corner cells stay safe from the drill', run(`(() => {
+  placeBlock(BP_WALL, RSTONE, 5, 5, true); placeBlock(BP_SLOPE_BL, RSTONE, 8, 5, true);
+  const wallCell = 5 * BS * W + 5 * BS + 1; let seal = -1;
+  for (let i = 0; i < N; i++) if (slopeSealOwner(i) >= 0 && PH[mat[i]] === PH_SOLID) { seal = i; break; }
+  return !crumbly(wallCell) && (seal < 0 || !crumbly(seal));
+})()`));
+check('a mold and what sets inside it stay safe from the drill', run(`(() => {
+  bag[RSTONE] = 400; bagTotal = 400; const err = placeMoldAt('ingot', 30, 10, RSTONE);
+  const mo = molds[molds.length - 1]; if (err || !mo) return false;
+  for (const i of moldCellsAt(mo.kind, mo.x, mo.y).walls) if (crumbly(i)) return false;
+  return true;
+})()`));
 done();