Detect tuple struct incorrectly used as struct pat

1 files changed, 39 insertions, 0 deletions

diff --git a/src/librustc_error_codes/error_codes/E0769.md b/src/librustc_error_codes/error_codes/E0769.md
new file mode 100644
index 00000000000..d1995be9899
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+++ b/src/librustc_error_codes/error_codes/E0769.md
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+A tuple struct or tuple variant was used in a pattern as if it were a
+struct or struct variant.
+
+Erroneous code example:
+
+```compile_fail,E0769
+enum E {
+    A(i32),
+}
+let e = E::A(42);
+match e {
+    E::A { number } => println!("{}", x),
+}
+```
+
+To fix this error, you can use the tuple pattern:
+
+```
+# enum E {
+#     A(i32),
+# }
+# let e = E::A(42);
+match e {
+    E::A(number) => println!("{}", number),
+}
+```
+
+Alternatively, you can also use the struct pattern by using the correct
+field names and binding them to new identifiers:
+
+```
+# enum E {
+#     A(i32),
+# }
+# let e = E::A(42);
+match e {
+    E::A { 0: number } => println!("{}", number),
+}
+```