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The error mentions `///`, when it's actually `//!`: error[E0658]: attributes on expressions are experimental --> test.rs:4:9 | 4 | //! wah | ^^^^^^^ | = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable = help: `///` is for documentation comments. For a plain comment, use `//`.