Imports (use
statements) are not allowed after non-item statements, such as variable declarations and expression statements.
Here is an example that demonstrates the error:
fn f() { // Variable declaration before import let x = 0; use std::io::Read; // ... }
The solution is to declare the imports at the top of the block, function, or file.
Here is the previous example again, with the correct order:
fn f() { use std::io::Read; let x = 0; // ... }
See the Declaration Statements section of the reference for more information about what constitutes an Item declaration and what does not: