Error code E0412
A used type name is not in scope.
Erroneous code examples:
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To fix this error, please verify you didn't misspell the type name, you did declare it or imported it into the scope. Examples:
Another case that causes this error is when a type is imported into a parent
module. To fix this, you can follow the suggestion and use File directly or
use super::File;
which will import the types from the parent namespace. An
example that causes this error is below:
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