solidity/test/libsolidity/syntaxTests/immutable/double_specifier.sol

contract C {
    uint immutable immutable x;
    uint immutable constant x;
}
// ----
// ParserError: (32-41): Mutability already set to "immutable"
// ParserError: (64-72): Mutability already set to "immutable"
Parsing of immutable state variable. 2020-02-27 15:13:55 +00:00			`contract C {`
			`uint immutable immutable x;`
			`uint immutable constant x;`
			`}`
			`// ----`
Export immutability. 2020-04-07 09:10:10 +00:00			`// ParserError: (32-41): Mutability already set to "immutable"`
			`// ParserError: (64-72): Mutability already set to "immutable"`