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+A pattern for a struct fails to specify a sub-pattern for every one of the
+struct's fields.
+
+Erroneous code example:
+
+```compile_fail,E0027
+struct Dog {
+    name: String,
+    age: u32,
+}
+
+let d = Dog { name: "Rusty".to_string(), age: 8 };
+
+// This is incorrect.
+match d {
+    Dog { age: x } => {}
+}
+```
+
+To fix this error, ensure that each field from the struct's definition is
+mentioned in the pattern, or use `..` to ignore unwanted fields. Example:
+
+```
+struct Dog {
+    name: String,
+    age: u32,
+}
+
+let d = Dog { name: "Rusty".to_string(), age: 8 };
+
+match d {
+    Dog { name: ref n, age: x } => {}
+}
+
+// This is also correct (ignore unused fields).
+match d {
+    Dog { age: x, .. } => {}
+}
+```