Rollup merge of #95238 - TaKO8Ki:stop-emitting-E0026-for-struct-enum-with-underscore, r=estebank

Stop emitting E0026 for struct enums with underscores

This patch resolves a part of #83263;

r? `@estebank`

2 files changed, 36 insertions, 0 deletions

diff --git a/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.rs b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.rs
new file mode 100644
index 00000000000..c30b8a1e1f1
--- /dev/null
+++ b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.rs
@@ -0,0 +1,12 @@
+enum Foo {
+    Bar { bar: bool },
+    Other,
+}
+
+fn main() {
+    let foo = Some(Foo::Other);
+
+    if let Some(Foo::Bar {_}) = foo {}
+    //~^ ERROR expected identifier, found reserved identifier `_`
+    //~| ERROR pattern does not mention field `bar` [E0027]
+}
diff --git a/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.stderr b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.stderr
new file mode 100644
index 00000000000..16f751444a5
--- /dev/null
+++ b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.stderr
@@ -0,0 +1,24 @@
+error: expected identifier, found reserved identifier `_`
+  --> $DIR/struct-enum-ignoring-field-with-underscore.rs:9:27
+   |
+LL |     if let Some(Foo::Bar {_}) = foo {}
+   |                           ^ expected identifier, found reserved identifier
+
+error[E0027]: pattern does not mention field `bar`
+  --> $DIR/struct-enum-ignoring-field-with-underscore.rs:9:17
+   |
+LL |     if let Some(Foo::Bar {_}) = foo {}
+   |                 ^^^^^^^^^^^^ missing field `bar`
+   |
+help: include the missing field in the pattern
+   |
+LL |     if let Some(Foo::Bar {_, bar }) = foo {}
+   |                            ~~~~~~~
+help: if you don't care about this missing field, you can explicitly ignore it
+   |
+LL |     if let Some(Foo::Bar {_, .. }) = foo {}
+   |                            ~~~~~~
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0027`.