func foo(a: Int) { // ERROR: Cannot pass immutable value as inout argument: 'a' is a 'let' constant take(&a) } func take(_ x: inout Int) {} でもこっちはimplicit copyable consumingだと思うけどlet扱いっすよね
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func foo(a: Int) { // ERROR: Cannot pass immutable value as inout argument: 'a' is a 'let' constant take(&a) } func take(_ x: inout Int) {} 1