Error code E0554

Feature attributes are only allowed on the nightly release channel. Stable or beta compilers will not comply.

Erroneous code example:

#![feature(lang_items)] // error: `#![feature]` may not be used on the
                        //        stable release channel

If you need the feature, make sure to use a nightly release of the compiler (but be warned that the feature may be removed or altered in the future).

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