The maximum value of an enum was reached, so it cannot be automatically set in the next enum value. Erroneous code example:
#[repr(i64)] enum Foo { X = 0x7fffffffffffffff, Y, // error: enum discriminant overflowed on value after // 9223372036854775807: i64; set explicitly via // Y = -9223372036854775808 if that is desired outcome }
To fix this, please set manually the next enum value or put the enum variant with the maximum value at the end of the enum. Examples:
#[repr(i64)] enum Foo { X = 0x7fffffffffffffff, Y = 0, // ok! }
Or:
#[repr(i64)] enum Foo { Y = 0, // ok! X = 0x7fffffffffffffff, }