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$ cargo run
Compiling functions v0.1.0 (file:///projects/functions)
error[E0308]: mismatched types
--> src/main.rs:7:24
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7 | fn plus_one(x: i32) -> i32 {
| -------- ^^^ expected `i32`, found `()`
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| implicitly returns `()` as its body has no tail or `return` expression
8 | x + 1;
| - help: remove this semicolon to return this value
For more information about this error, try `rustc --explain E0308`.
error: could not compile `functions` due to previous error
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