Add new test for parsing errors on self pointers

Add new tests to highlight the behavior of errors thrown when meeting a
self pointer.

gcc/testsuite/ChangeLog:

	* rust/compile/self_const_ptr.rs: New test.
	* rust/compile/self_mut_ptr.rs: New test.
	* rust/compile/self_ptr.rs: New test.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

gcc/testsuite/rust/compile/self_const_ptr.rs

@@ -0,0 +1,8 @@
+struct MyStruct;
+
+impl MyStruct {
+    pub fn do_something(*const self) {}
+    // { dg-error "cannot pass .self. by raw pointer" "" { target *-*-* } .-1 }
+    // { dg-error "failed to parse inherent impl item in inherent impl" "" { target *-*-* } .-2 }
+    // { dg-error "failed to parse item in crate" "" { target *-*-* } .-3 }
+}

gcc/testsuite/rust/compile/self_mut_ptr.rs

@@ -0,0 +1,8 @@
+struct MyStruct;
+
+impl MyStruct {
+    pub fn do_something(*mut self) {}
+    // { dg-error "cannot pass .self. by raw pointer" "" { target *-*-* } .-1 }
+    // { dg-error "failed to parse inherent impl item in inherent impl" "" { target *-*-* } .-2 }
+    // { dg-error "failed to parse item in crate" "" { target *-*-* } .-3 }
+}

gcc/testsuite/rust/compile/self_ptr.rs

@@ -0,0 +1,8 @@
+struct MyStruct;
+
+impl MyStruct {
+    pub fn do_something(*self) {}
+    // { dg-error "cannot pass .self. by raw pointer" "" { target *-*-* } .-1 }
+    // { dg-error "failed to parse inherent impl item in inherent impl" "" { target *-*-* } .-2 }
+    // { dg-error "failed to parse item in crate" "" { target *-*-* } .-3 }
+}