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error: declaration of a nonstandard #[main] function may change over time, for now a top-level `fn main()` is required (see issue #29634)
--> $DIR/feature-gate-main.rs:12:1
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12 | fn foo() {} //~ ERROR: declaration of a nonstandard #[main] function may change over time
| ^^^^^^^^^^^
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= help: add #![feature(main)] to the crate attributes to enable
error: aborting due to previous error
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