test/wcc/data: grow the declarative compiler corpus to 1,224 fixtures

The r-prefixed waves absorb the runtime, reject, and byte-compare rows
of the migrated native carriers; each fixture is one directory with one
case.ww and a //ww:error, //ww:compile, //ww:run, or //ww:run-exit
directive covering both frontends.

test/wcc/data/r695_match_bind_mixed_struct/case.ww

@@ -0,0 +1,21 @@
+//ww:run
+package main;
+type mix = struct { x: i32, y: i32, z: i64, w: i64 };
+type tag = (mix | i32);
+type holder = struct { t: tag, mark: i32 };
+fn main() i32 = {
+	let h: holder;
+	h.mark = 99;
+	let m: mix = mix { x = 3, y = 5, z = 11i64, w = 12i64 };
+	h.t = (m: tag);
+	match (h.t) {
+	case let v: mix => {
+		if (v.x != 3) { return 10; };
+		if (v.y != 5) { return 11; };
+		if (v.z != 11i64) { return 12; };
+		if (v.w != 12i64) { return 13; };
+		return 0;
+	};
+	case let z: i32 => return 2;
+	};
+};