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+The maximum value of an enum was reached, so it cannot be automatically
+set in the next enum value.
+
+Erroneous code example:
+
+```compile_fail,E0370
+#[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,
+}
+```