Add failing tests for #46

These passed before 02cd324.

tests/ui/lang/core/ptr/allocate_default_array_of_array.rs

@@ -0,0 +1,8 @@
+// build-fail
+
+use spirv_std::spirv;
+
+#[spirv(fragment)]
+pub fn main() {
+    let x = [[1; 2]; 1];
+}

tests/ui/lang/core/ptr/allocate_default_array_of_array.stderr

@@ -0,0 +1,21 @@
+error: cannot cast between pointer types
+       from `*i32`
+         to `*[i32; 2]`
+ --> $DIR/allocate_default_array_of_array.rs:7:13
+  |
+7 |     let x = [[1; 2]; 1];
+  |             ^^^^^^^^^^^
+  |
+note: used from within `allocate_default_array_of_array::main`
+ --> $DIR/allocate_default_array_of_array.rs:7:13
+  |
+7 |     let x = [[1; 2]; 1];
+  |             ^^^^^^^^^^^
+note: called by `main`
+ --> $DIR/allocate_default_array_of_array.rs:6:8
+  |
+6 | pub fn main() {
+  |        ^^^^
+
+error: aborting due to 1 previous error
+

tests/ui/lang/core/ptr/allocate_default_array_of_array_in_struct.rs

@@ -0,0 +1,14 @@
+// build-fail
+
+use spirv_std::spirv;
+
+#[derive(Default)]
+struct Foo {
+    bar: bool,
+    baz: [[u32; 2]; 1],
+}
+
+#[spirv(fragment)]
+pub fn main() {
+    let x = [Foo::default(); 1];
+}

tests/ui/lang/core/ptr/allocate_default_array_of_array_in_struct.stderr

@@ -0,0 +1,21 @@
+error: cannot cast between pointer types
+       from `*[[u32; 2]; 1]`
+         to `*struct Foo { baz: [[u32; 2]; 1], bar: bool }`
+  --> $DIR/allocate_default_array_of_array_in_struct.rs:13:13
+   |
+13 |     let x = [Foo::default(); 1];
+   |             ^^^^^^^^^^^^^^^^^^^
+   |
+note: used from within `allocate_default_array_of_array_in_struct::main`
+  --> $DIR/allocate_default_array_of_array_in_struct.rs:13:13
+   |
+13 |     let x = [Foo::default(); 1];
+   |             ^^^^^^^^^^^^^^^^^^^
+note: called by `main`
+  --> $DIR/allocate_default_array_of_array_in_struct.rs:12:8
+   |
+12 | pub fn main() {
+   |        ^^^^
+
+error: aborting due to 1 previous error
+