---
source: tests/test_roundtrip.rs
description: "ComplexNested { maybe_vec_maybe: Some([Some(\"hello\"), None, Some(\"world\")]), matrix: [[1, 2, 3], [4, 5, 6], [7, 8, 9]], map_of_vecs: {\"colors\": [\"red\", \"blue\"], \"sizes\": [\"small\", \"medium\", \"large\"]}, vec_of_maps: [{\"b\": 2, \"a\": 1}, {\"x\": 10, \"y\": 20}], complex_tuple: [(\"first\", Some([1, 2, 3])), (\"second\", None), (\"third\", Some([4, 5]))] }"
---
complex_tuple%5B0%5D%5B0%5D=first&
complex_tuple%5B0%5D%5B1%5D%5B0%5D=1&
complex_tuple%5B0%5D%5B1%5D%5B1%5D=2&
complex_tuple%5B0%5D%5B1%5D%5B2%5D=3&
complex_tuple%5B1%5D%5B0%5D=second&
complex_tuple%5B1%5D%5B1%5D&
complex_tuple%5B2%5D%5B0%5D=third&
complex_tuple%5B2%5D%5B1%5D%5B0%5D=4&
complex_tuple%5B2%5D%5B1%5D%5B1%5D=5&
map_of_vecs%5Bcolors%5D%5B0%5D=red&
map_of_vecs%5Bcolors%5D%5B1%5D=blue&
map_of_vecs%5Bsizes%5D%5B0%5D=small&
map_of_vecs%5Bsizes%5D%5B1%5D=medium&
map_of_vecs%5Bsizes%5D%5B2%5D=large&
matrix%5B0%5D%5B0%5D=1&
matrix%5B0%5D%5B1%5D=2&
matrix%5B0%5D%5B2%5D=3&
matrix%5B1%5D%5B0%5D=4&
matrix%5B1%5D%5B1%5D=5&
matrix%5B1%5D%5B2%5D=6&
matrix%5B2%5D%5B0%5D=7&
matrix%5B2%5D%5B1%5D=8&
matrix%5B2%5D%5B2%5D=9&
maybe_vec_maybe%5B0%5D=hello&
maybe_vec_maybe%5B1%5D&
maybe_vec_maybe%5B2%5D=world&
vec_of_maps%5B0%5D%5Ba%5D=1&
vec_of_maps%5B0%5D%5Bb%5D=2&
vec_of_maps%5B1%5D%5Bx%5D=10&
vec_of_maps%5B1%5D%5By%5D=20