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error[E0277]: expected a `Fn<(char,)>` closure, found `char`
--> $DIR/root-obligation.rs:6:38
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LL | .filter(|c| "aeiou".contains(c))
| -------- ^ expected an `Fn<(char,)>` closure, found `char`
| |
| required by a bound introduced by this call
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= help: the trait `Fn<(char,)>` is not implemented for `char`
= note: required for `&char` to implement `FnOnce<(char,)>`
= note: required for `&char` to implement `Pattern<'_>`
note: required by a bound in `core::str::<impl str>::contains`
--> $SRC_DIR/core/src/str/mod.rs:LL:COL
help: consider dereferencing here
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LL | .filter(|c| "aeiou".contains(*c))
| +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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