solidity/test/libsolidity/semanticTests/storage/complex_accessors.sol

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contract test {
mapping(uint256 => bytes4) public to_string_map;
mapping(uint256 => bool) public to_bool_map;
mapping(uint256 => uint256) public to_uint_map;
mapping(uint256 => mapping(uint256 => uint256)) public to_multiple_map;
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constructor() {
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to_string_map[42] = "24";
to_bool_map[42] = false;
to_uint_map[42] = 12;
to_multiple_map[42][23] = 31;
}
}
// ====
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// ----
// to_string_map(uint256): 42 -> "24"
// to_bool_map(uint256): 42 -> false
// to_uint_map(uint256): 42 -> 12
// to_multiple_map(uint256,uint256): 42, 23 -> 31