Add more tests for borrowck and dropck slice pattern handling

src/test/ui/borrowck/borrowck-move-out-from-array-no-overlap.rs

@@ -0,0 +1,69 @@
+// check-pass
+
+#![feature(slice_patterns)]
+
+fn array() -> [(String, String); 3] {
+    Default::default()
+}
+
+// Const Index + Const Index
+
+fn move_out_from_begin_and_one_from_end() {
+    let a = array();
+    let [_, _, _x] = a;
+    let [.., _y, _] = a;
+}
+
+fn move_out_from_begin_field_and_end_field() {
+    let a = array();
+    let [_, _, (_x, _)] = a;
+    let [.., (_, _y)] = a;
+}
+
+// Const Index + Slice
+
+fn move_out_by_const_index_and_subslice() {
+    let a = array();
+    let [_x, _, _] = a;
+    let [_, _y @ ..] = a;
+}
+
+fn move_out_by_const_index_end_and_subslice() {
+    let a = array();
+    let [.., _x] = a;
+    let [_y @ .., _] = a;
+}
+
+fn move_out_by_const_index_field_and_subslice() {
+    let a = array();
+    let [(_x, _), _, _] = a;
+    let [_, _y @ ..] = a;
+}
+
+fn move_out_by_const_index_end_field_and_subslice() {
+    let a = array();
+    let [.., (_x, _)] = a;
+    let [_y @ .., _] = a;
+}
+
+fn move_out_by_const_subslice_and_index_field() {
+    let a = array();
+    let [_, _y @ ..] = a;
+    let [(_x, _), _, _] = a;
+}
+
+fn move_out_by_const_subslice_and_end_index_field() {
+    let a = array();
+    let [_y @ .., _] = a;
+    let [.., (_x, _)] = a;
+}
+
+// Slice + Slice
+
+fn move_out_by_subslice_and_subslice() {
+    let a = array();
+    let [x @ .., _, _] = a;
+    let [_, _y @ ..] = a;
+}
+
+fn main() {}

src/test/ui/borrowck/borrowck-move-out-from-array-use-no-overlap.rs

@@ -0,0 +1,69 @@
+// check-pass
+
+#![feature(slice_patterns)]
+
+fn array() -> [(String, String); 3] {
+    Default::default()
+}
+
+// Const Index + Const Index
+
+fn move_out_from_begin_and_one_from_end() {
+    let a = array();
+    let [_, _, _x] = a;
+    let [.., ref _y, _] = a;
+}
+
+fn move_out_from_begin_field_and_end_field() {
+    let a = array();
+    let [_, _, (_x, _)] = a;
+    let [.., (_, ref _y)] = a;
+}
+
+// Const Index + Slice
+
+fn move_out_by_const_index_and_subslice() {
+    let a = array();
+    let [_x, _, _] = a;
+    let [_, ref _y @ ..] = a;
+}
+
+fn move_out_by_const_index_end_and_subslice() {
+    let a = array();
+    let [.., _x] = a;
+    let [ref _y @ .., _] = a;
+}
+
+fn move_out_by_const_index_field_and_subslice() {
+    let a = array();
+    let [(_x, _), _, _] = a;
+    let [_, ref _y @ ..] = a;
+}
+
+fn move_out_by_const_index_end_field_and_subslice() {
+    let a = array();
+    let [.., (_x, _)] = a;
+    let [ref _y @ .., _] = a;
+}
+
+fn move_out_by_const_subslice_and_index_field() {
+    let a = array();
+    let [_, _y @ ..] = a;
+    let [(ref _x, _), _, _] = a;
+}
+
+fn move_out_by_const_subslice_and_end_index_field() {
+    let a = array();
+    let [_y @ .., _] = a;
+    let [.., (ref _x, _)] = a;
+}
+
+// Slice + Slice
+
+fn move_out_by_subslice_and_subslice() {
+    let a = array();
+    let [x @ .., _, _] = a;
+    let [_, ref _y @ ..] = a;
+}
+
+fn main() {}

src/test/ui/borrowck/borrowck-move-out-from-array-use.rs

@@ -0,0 +1,99 @@
+#![feature(slice_patterns)]
+
+fn array() -> [(String, String); 3] {
+    Default::default()
+}
+
+// Const Index + Const Index
+
+fn move_out_from_begin_and_end() {
+    let a = array();
+    let [_, _, _x] = a;
+    let [.., ref _y] = a; //~ ERROR [E0382]
+}
+
+fn move_out_from_begin_field_and_end() {
+    let a = array();
+    let [_, _, (_x, _)] = a;
+    let [.., ref _y] = a; //~ ERROR [E0382]
+}
+
+fn move_out_from_begin_field_and_end_field() {
+    let a = array();
+    let [_, _, (_x, _)] = a;
+    let [.., (ref _y, _)] = a; //~ ERROR [E0382]
+}
+
+// Const Index + Slice
+
+fn move_out_by_const_index_and_subslice() {
+    let a = array();
+    let [_x, _, _] = a;
+    let [ref _y @ .., _, _] = a; //~ ERROR [E0382]
+}
+
+fn move_out_by_const_index_end_and_subslice() {
+    let a = array();
+    let [.., _x] = a;
+    let [_, _, ref _y @ ..] = a; //~ ERROR [E0382]
+}
+
+fn move_out_by_const_index_field_and_subslice() {
+    let a = array();
+    let [(_x, _), _, _] = a;
+    let [ref _y @ .., _, _] = a; //~ ERROR [E0382]
+}
+
+fn move_out_by_const_index_end_field_and_subslice() {
+    let a = array();
+    let [.., (_x, _)] = a;
+    let [_, _, ref _y @ ..] = a; //~ ERROR [E0382]
+}
+
+fn move_out_by_subslice_and_const_index_field() {
+    let a = array();
+    let [_y @ .., _, _] = a;
+    let [(ref _x, _), _, _] = a; //~ ERROR [E0382]
+}
+
+fn move_out_by_subslice_and_const_index_end_field() {
+    let a = array();
+    let [_, _, _y @ ..] = a;
+    let [.., (ref _x, _)] = a; //~ ERROR [E0382]
+}
+
+// Slice + Slice
+
+fn move_out_by_subslice_and_subslice() {
+    let a = array();
+    let [x @ .., _] = a;
+    let [_, ref _y @ ..] = a; //~ ERROR [E0382]
+}
+
+// Move + Assign
+
+fn move_out_and_assign_end() {
+    let mut a = array();
+    let [_, _, _x] = a;
+    a[2] = Default::default(); //~ ERROR [E0382]
+}
+
+fn move_out_and_assign_end_field() {
+    let mut a = array();
+    let [_, _, (_x, _)] = a;
+    a[2].1 = Default::default(); //~ ERROR [E0382]
+}
+
+fn move_out_slice_and_assign_end() {
+    let mut a = array();
+    let [_, _, _x @ ..] = a;
+    a[0] = Default::default(); //~ ERROR [E0382]
+}
+
+fn move_out_slice_and_assign_end_field() {
+    let mut a = array();
+    let [_, _, _x @ ..] = a;
+    a[0].1 = Default::default(); //~ ERROR [E0382]
+}
+
+fn main() {}

src/test/ui/borrowck/borrowck-move-out-from-array-use.stderr

@@ -0,0 +1,143 @@
+error[E0382]: borrow of moved value: `a[..]`
+  --> $DIR/borrowck-move-out-from-array-use.rs:12:14
+   |
+LL |     let [_, _, _x] = a;
+   |                -- value moved here
+LL |     let [.., ref _y] = a;
+   |              ^^^^^^ value borrowed here after move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a[..]`
+  --> $DIR/borrowck-move-out-from-array-use.rs:18:14
+   |
+LL |     let [_, _, (_x, _)] = a;
+   |                 -- value moved here
+LL |     let [.., ref _y] = a;
+   |              ^^^^^^ value borrowed here after partial move
+   |
+   = note: move occurs because `a[..].0` has type `std::string::String`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a[..].0`
+  --> $DIR/borrowck-move-out-from-array-use.rs:24:15
+   |
+LL |     let [_, _, (_x, _)] = a;
+   |                 -- value moved here
+LL |     let [.., (ref _y, _)] = a;
+   |               ^^^^^^ value borrowed here after move
+   |
+   = note: move occurs because `a[..].0` has type `std::string::String`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:32:10
+   |
+LL |     let [_x, _, _] = a;
+   |          -- value moved here
+LL |     let [ref _y @ .., _, _] = a;
+   |          ^^^^^^^^^^^ value borrowed here after partial move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:38:16
+   |
+LL |     let [.., _x] = a;
+   |              -- value moved here
+LL |     let [_, _, ref _y @ ..] = a;
+   |                ^^^^^^^^^^^ value borrowed here after partial move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:44:10
+   |
+LL |     let [(_x, _), _, _] = a;
+   |           -- value moved here
+LL |     let [ref _y @ .., _, _] = a;
+   |          ^^^^^^^^^^^ value borrowed here after partial move
+   |
+   = note: move occurs because `a[..].0` has type `std::string::String`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:50:16
+   |
+LL |     let [.., (_x, _)] = a;
+   |               -- value moved here
+LL |     let [_, _, ref _y @ ..] = a;
+   |                ^^^^^^^^^^^ value borrowed here after partial move
+   |
+   = note: move occurs because `a[..].0` has type `std::string::String`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a[..]`
+  --> $DIR/borrowck-move-out-from-array-use.rs:56:11
+   |
+LL |     let [_y @ .., _, _] = a;
+   |          ------- value moved here
+LL |     let [(ref _x, _), _, _] = a;
+   |           ^^^^^^ value borrowed here after move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a[..]`
+  --> $DIR/borrowck-move-out-from-array-use.rs:62:15
+   |
+LL |     let [_, _, _y @ ..] = a;
+   |                ------- value moved here
+LL |     let [.., (ref _x, _)] = a;
+   |               ^^^^^^ value borrowed here after move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: borrow of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:70:13
+   |
+LL |     let [x @ .., _] = a;
+   |          ------ value moved here
+LL |     let [_, ref _y @ ..] = a;
+   |             ^^^^^^^^^^^ value borrowed here after partial move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: use of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:78:5
+   |
+LL |     let [_, _, _x] = a;
+   |                -- value moved here
+LL |     a[2] = Default::default();
+   |     ^^^^ value used here after partial move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: use of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:84:5
+   |
+LL |     let [_, _, (_x, _)] = a;
+   |                 -- value moved here
+LL |     a[2].1 = Default::default();
+   |     ^^^^ value used here after partial move
+   |
+   = note: move occurs because `a[..].0` has type `std::string::String`, which does not implement the `Copy` trait
+
+error[E0382]: use of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:90:5
+   |
+LL |     let [_, _, _x @ ..] = a;
+   |                ------- value moved here
+LL |     a[0] = Default::default();
+   |     ^^^^ value used here after partial move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error[E0382]: use of moved value: `a`
+  --> $DIR/borrowck-move-out-from-array-use.rs:96:5
+   |
+LL |     let [_, _, _x @ ..] = a;
+   |                ------- value moved here
+LL |     a[0].1 = Default::default();
+   |     ^^^^ value used here after partial move
+   |
+   = note: move occurs because `a[..]` has type `(std::string::String, std::string::String)`, which does not implement the `Copy` trait
+
+error: aborting due to 14 previous errors
+
+For more information about this error, try `rustc --explain E0382`.