chore: import upstream snapshot with attribution

tests/fixtures/sample.zig

@@ -0,0 +1,37 @@
+const std = @import("std");
+const mem = @import("std").mem;
+
+const Point = struct {
+    x: f64,
+    y: f64,
+
+    pub fn distance(self: Point, other: Point) f64 {
+        const dx = self.x - other.x;
+        const dy = self.y - other.dy;
+        return std.math.sqrt(dx * dx + dy * dy);
+    }
+};
+
+const Color = enum {
+    red,
+    green,
+    blue,
+};
+
+const Shape = union(enum) {
+    circle: f64,
+    rect: Point,
+};
+
+pub fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+
+pub fn multiply(a: i32, b: i32) i32 {
+    return a * b;
+}
+
+pub fn main() void {
+    const result = add(1, 2);
+    _ = multiply(result, 3);
+}