solidity/test/libsolidity/syntaxTests/lvalues/external_reference_argument.sol

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contract C {
    function f(uint256[] calldata x, uint256[] calldata y) external pure {
        x = y;
    }
}
// ----
// TypeError: (96-97): External function arguments of reference type are read-only.
Better error messages when writing to expressions that cannot be written to. 2019-08-12 15:06:10 +00:00			`contract C {`
			`function f(uint256[] calldata x, uint256[] calldata y) external pure {`
			`x = y;`
			`}`
			`}`
			`// ----`
			`// TypeError: (96-97): External function arguments of reference type are read-only.`