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+It is not allowed to use or capture an uninitialized variable.
+
+Erroneous code example:
+
+```compile_fail,E0381
+fn main() {
+    let x: i32;
+    let y = x; // error, use of possibly-uninitialized variable
+}
+```
+
+To fix this, ensure that any declared variables are initialized before being
+used. Example:
+
+```
+fn main() {
+    let x: i32 = 0;
+    let y = x; // ok!
+}
+```