chore: import upstream snapshot with attribution

examples/batch3-cli/src/main.0

@@ -0,0 +1,26 @@
+use names
+
+use validate
+
+pub fn main(world: World) -> Void raises [NotFound, TooLarge, Io] {
+    let fs: Fs = std.fs.host()
+    var path_storage: [64]u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+    let joined: Maybe<String> = std.path.join(path_storage, ".zero", inputName())
+    if !joined.has {
+        raise TooLarge
+    }
+    let path: String = joined.value
+    let created: Maybe<owned<File>> = std.fs.create(fs, path)
+    if created.has {
+        var file: owned<File> = created.value
+        if !std.fs.writeAll(&mut file, std.mem.span("batch3 cli ok\n")) {
+            return
+        }
+    }
+    var read_storage: [64]u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+    var alloc: FixedBufAlloc = std.mem.fixedBufAlloc(read_storage)
+    var body: owned<ByteBuf> = check std.fs.readAllOrRaise(alloc, fs, path, 64)
+    if isExpected(std.mem.bufBytes(&body)) {
+        check world.out.write("batch3 cli ok\n")
+    }
+}

examples/batch3-cli/src/names.0

@@ -0,0 +1,3 @@
+pub fn inputName() -> String {
+    return std.args.getOr(1, "batch3.txt")
+}

examples/batch3-cli/src/validate.0

@@ -0,0 +1,3 @@
+pub fn isExpected(bytes: MutSpan<u8>) -> Bool {
+    return std.mem.eqlBytes(bytes, std.mem.span("batch3 cli ok\n"))
+}