lua: coroutines (create/resume/yield/status/wrap) via call/cc +8 tests

lib/lua/test.sh

@@ -710,6 +710,24 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 980)
 (eval "(lua-eval-ast \"local t = setmetatable({x = 1, y = 2}, {}) local n = 0 for k in pairs(t) do n = n + 1 end return n\")")
 
+;; ── Phase 5: coroutines ────────────────────────────────────────
+(epoch 1000)
+(eval "(lua-eval-ast \"local co = coroutine.create(function() end) return coroutine.status(co)\")")
+(epoch 1001)
+(eval "(lua-eval-ast \"local co = coroutine.create(function() return 42 end) coroutine.resume(co) return coroutine.status(co)\")")
+(epoch 1010)
+(eval "(lua-eval-ast \"local co = coroutine.create(function() coroutine.yield(1) coroutine.yield(2) return 3 end) local ok1, v1 = coroutine.resume(co) local ok2, v2 = coroutine.resume(co) local ok3, v3 = coroutine.resume(co) return v1 * 100 + v2 * 10 + v3\")")
+(epoch 1011)
+(eval "(lua-eval-ast \"local co = coroutine.create(function(a, b) return a + b end) local ok, v = coroutine.resume(co, 10, 20) return v\")")
+(epoch 1012)
+(eval "(lua-eval-ast \"local co = coroutine.create(function() local x = coroutine.yield() return x + 100 end) coroutine.resume(co) local ok, v = coroutine.resume(co, 42) return v\")")
+(epoch 1020)
+(eval "(lua-eval-ast \"local co = coroutine.create(function() return 42 end) coroutine.resume(co) local ok, err = coroutine.resume(co) if ok then return \\\"no\\\" else return err end\")")
+(epoch 1030)
+(eval "(lua-eval-ast \"local gen = coroutine.wrap(function() coroutine.yield(1) coroutine.yield(2) coroutine.yield(3) end) return gen() + gen() + gen()\")")
+(epoch 1040)
+(eval "(lua-eval-ast \"local function iter() coroutine.yield(10) coroutine.yield(20) coroutine.yield(30) end local co = coroutine.create(iter) local sum = 0 for i = 1, 3 do local ok, v = coroutine.resume(co) sum = sum + v end return sum\")")
+
 EPOCHS
 
 OUTPUT=$(timeout 60 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
@@ -1062,6 +1080,16 @@ check 970 "stateful closure iter"           '15'
 check 971 "3-value iterator form"           '30'
 check 980 "pairs skips __meta"              '2'
 
+# ── Phase 5: coroutines ────────────────────────────────────────
+check 1000 "coroutine.status initial"       '"suspended"'
+check 1001 "coroutine.status after done"    '"dead"'
+check 1010 "yield/resume × 3 sequence"      '123'
+check 1011 "resume passes args to body"     '30'
+check 1012 "resume passes args via yield"   '142'
+check 1020 "resume dead returns error"      '"cannot resume dead coroutine"'
+check 1030 "coroutine.wrap"                 '6'
+check 1040 "iterator via coroutine"         '60'
+
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "ok $PASS/$TOTAL Lua-on-SX tests passed"