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error[E0433]: failed to resolve: use of undeclared type `HashMap`
--> $DIR/issue-31997-1.rs:20:19
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LL | let mut map = HashMap::new();
| ^^^^^^^ not found in this scope
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help: consider importing this struct
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LL | use std::collections::HashMap;
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0433`.
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