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error[E0308]: mismatched types
--> $DIR/chain-method-call-mutation-in-place.rs:3:5
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LL | fn foo(mut s: String) -> String {
| ------ expected `String` because of return type
LL | s.push_str("asdf")
| ^^^^^^^^^^^^^^^^^^ expected struct `String`, found `()`
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note: method `push_str` modifies its receiver in-place
--> $DIR/chain-method-call-mutation-in-place.rs:3:7
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LL | s.push_str("asdf")
| - ^^^^^^^^ this call modifies `s` in-place
| |
| you probably want to use this value after calling the method...
= note: ...instead of the `()` output of method `push_str`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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