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+The value of `N` that was specified for `repr(align(N))` was not a power
+of two, or was greater than 2^29.
+
+Erroneous code example:
+
+```compile_fail,E0589
+#[repr(align(15))] // error: invalid `repr(align)` attribute: not a power of two
+enum Foo {
+ Bar(u64),
+}
+```