Add test for capturing enums

Author: arora-aman

src/test/ui/closures/2229_closure_analysis/capture-enums.rs

@@ -0,0 +1,56 @@
+#![feature(capture_disjoint_fields)]
+//~^ WARNING the feature `capture_disjoint_fields` is incomplete
+#![feature(rustc_attrs)]
+
+enum Info {
+    Point(i32, i32, String),
+    Meta(String, Vec<(i32, i32)>)
+}
+
+fn multi_variant_enum() {
+    let point = Info::Point(10, -10, "1".into());
+
+    let vec = Vec::new();
+    let meta = Info::Meta("meta".into(), vec);
+
+    let c = #[rustc_capture_analysis]
+    //~^ ERROR: attributes on expressions are experimental
+    || {
+        if let Info::Point(_, _, str) = point {
+            //~^ Capturing point[] -> ImmBorrow
+            //~| Capturing point[(2, 0)] -> ByValue
+            //~| Min Capture point[] -> ByValue
+            println!("{}", str);
+        }
+
+        if let Info::Meta(_, v) = meta {
+            //~^ Capturing meta[] -> ImmBorrow
+            //~| Capturing meta[(1, 1)] -> ByValue
+            //~| Min Capture meta[] -> ByValue
+            println!("{:?}", v);
+        }
+    };
+
+    c();
+}
+
+enum SingleVariant {
+    Point(i32, i32, String),
+}
+
+fn single_variant_enum() {
+    let point = SingleVariant::Point(10, -10, "1".into());
+
+    let c = #[rustc_capture_analysis]
+    //~^ ERROR: attributes on expressions are experimental
+    || {
+    let SingleVariant::Point(_, _, str) = point;
+        //~^ Capturing point[(2, 0)] -> ByValue
+        //~| Min Capture point[(2, 0)] -> ByValue
+        println!("{}", str);
+    };
+
+    c();
+}
+
+fn main() {}

src/test/ui/closures/2229_closure_analysis/capture-enums.stderr

@@ -0,0 +1,78 @@
+error[E0658]: attributes on expressions are experimental
+  --> $DIR/capture-enums.rs:16:13
+   |
+LL |     let c = #[rustc_capture_analysis]
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
+   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+
+error[E0658]: attributes on expressions are experimental
+  --> $DIR/capture-enums.rs:44:13
+   |
+LL |     let c = #[rustc_capture_analysis]
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
+   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+
+warning: the feature `capture_disjoint_fields` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/capture-enums.rs:1:12
+   |
+LL | #![feature(capture_disjoint_fields)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #53488 <https://github.com/rust-lang/rust/issues/53488> for more information
+
+error: Capturing point[] -> ImmBorrow
+  --> $DIR/capture-enums.rs:19:41
+   |
+LL |         if let Info::Point(_, _, str) = point {
+   |                                         ^^^^^
+
+error: Capturing point[(2, 0)] -> ByValue
+  --> $DIR/capture-enums.rs:19:41
+   |
+LL |         if let Info::Point(_, _, str) = point {
+   |                                         ^^^^^
+
+error: Capturing meta[] -> ImmBorrow
+  --> $DIR/capture-enums.rs:26:35
+   |
+LL |         if let Info::Meta(_, v) = meta {
+   |                                   ^^^^
+
+error: Capturing meta[(1, 1)] -> ByValue
+  --> $DIR/capture-enums.rs:26:35
+   |
+LL |         if let Info::Meta(_, v) = meta {
+   |                                   ^^^^
+
+error: Min Capture point[] -> ByValue
+  --> $DIR/capture-enums.rs:19:41
+   |
+LL |         if let Info::Point(_, _, str) = point {
+   |                                         ^^^^^
+
+error: Min Capture meta[] -> ByValue
+  --> $DIR/capture-enums.rs:26:35
+   |
+LL |         if let Info::Meta(_, v) = meta {
+   |                                   ^^^^
+
+error: Capturing point[(2, 0)] -> ByValue
+  --> $DIR/capture-enums.rs:47:43
+   |
+LL |     let SingleVariant::Point(_, _, str) = point;
+   |                                           ^^^^^
+
+error: Min Capture point[(2, 0)] -> ByValue
+  --> $DIR/capture-enums.rs:47:43
+   |
+LL |     let SingleVariant::Point(_, _, str) = point;
+   |                                           ^^^^^
+
+error: aborting due to 10 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0658`.