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+#### Note: this error code is no longer emitted by the compiler.
+
+Closures cannot mutate immutable captured variables.
+
+Erroneous code example:
+
+```compile_fail,E0594
+let x = 3; // error: closure cannot assign to immutable local variable `x`
+let mut c = || { x += 1 };
+```
+
+Make the variable binding mutable:
+
+```
+let mut x = 3; // ok!
+let mut c = || { x += 1 };
+```