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error[E0005]: refutable pattern in function argument
--> $DIR/refutable-pattern-in-fn-arg.rs:2:14
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LL | let f = |3: isize| println!("hello");
| ^ pattern `_` not covered
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= note: the matched value is of type `isize`
help: alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits
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LL | let f = |_3: isize| println!("hello");
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0005`.
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