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+fn main() {
+ // The easiest way to fix the compiler error is to initialize the
+ // variable `x`. By setting its value to an integer, Rust infers its type
+ // as `i32` which is the default type for integers.
+ let x = 42;
+
+ // But we can enforce a type different from the default `i32` by adding
+ // a type annotation:
+ // let x: u8 = 42;
+
+ if x == 10 {
+ println!("x is ten!");
+ } else {
+ println!("x is not ten!");
+ }
+}