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$ cargo run
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Compiling functions v0.1.0 (file:///projects/functions)
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error: expected expression, found `let` statement
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--> src/main.rs:2:14
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2 | let x = (let y = 6);
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| ^^^
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error: expected expression, found statement (`let`)
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--> src/main.rs:2:14
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2 | let x = (let y = 6);
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| ^^^^^^^^^
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= note: variable declaration using `let` is a statement
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error[E0658]: `let` expressions in this position are unstable
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--> src/main.rs:2:14
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2 | let x = (let y = 6);
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| ^^^^^^^^^
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= note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
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warning: unnecessary parentheses around assigned value
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--> src/main.rs:2:13
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2 | let x = (let y = 6);
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| ^ ^
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= note: `#[warn(unused_parens)]` on by default
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help: remove these parentheses
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2 - let x = (let y = 6);
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2 + let x = let y = 6;
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For more information about this error, try `rustc --explain E0658`.
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warning: `functions` (bin "functions") generated 1 warning
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error: could not compile `functions` due to 3 previous errors; 1 warning emitted
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