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+A lifetime name is shadowing another lifetime name.
+
+Erroneous code example:
+
+```compile_fail,E0496
+struct Foo<'a> {
+    a: &'a i32,
+}
+
+impl<'a> Foo<'a> {
+    fn f<'a>(x: &'a i32) { // error: lifetime name `'a` shadows a lifetime
+                           //        name that is already in scope
+    }
+}
+```
+
+Please change the name of one of the lifetimes to remove this error. Example:
+
+```
+struct Foo<'a> {
+    a: &'a i32,
+}
+
+impl<'a> Foo<'a> {
+    fn f<'b>(x: &'b i32) { // ok!
+    }
+}
+
+fn main() {
+}
+```