Rust: Add test cases for diagnostics.

Author: geoffw0

rust/ql/test/query-tests/diagnostics/does_not_compile.rs

@@ -0,0 +1,3 @@
+pub fn my_func() {
+	This is not correct Rust code.
+}

rust/ql/test/query-tests/diagnostics/error.rs

@@ -0,0 +1,3 @@
+pub fn my_func() {
+    compile_error!("An error!");
+}

rust/ql/test/query-tests/diagnostics/main.rs

@@ -0,0 +1,18 @@
+/**
+ * total lines in this file: 18
+ * of which code: 7
+ * of which only comments: 7
+ * of which blank: 4
+ */
+
+mod my_struct;
+mod my_macro;
+
+// another comment
+
+fn main() {
+    println!("Hello, world!"); // another comment
+
+    my_struct::my_func();
+    my_macro::my_func();
+}

rust/ql/test/query-tests/diagnostics/my_macro.rs

@@ -0,0 +1,18 @@
+/**
+ * total lines in this file: 18
+ * of which code: 10
+ * of which only comments: 6
+ * of which blank: 2
+ */
+
+macro_rules! myMacro {
+    () => {
+        println!("Hello, world!");
+    };
+}
+
+pub fn my_func() {
+    if true {
+        myMacro!();
+    }
+}

rust/ql/test/query-tests/diagnostics/my_struct.rs

@@ -0,0 +1,30 @@
+#![allow(dead_code)]
+/**
+ * total lines in this file: 30
+ * of which code: 20
+ * of which only comments: 6
+ * of which blank: 4
+ */
+
+#[derive(Debug)]
+struct MyStruct {
+    name: String,
+    value: i32,
+}
+
+impl MyStruct {
+    fn my_method(&self) {
+        println!("Hello, world!");
+    }
+}
+
+pub fn my_func() {
+    let _a = 1;
+    let b: MyStruct =
+        MyStruct {
+            name: String::from("abc"),
+            value: 123,
+        };
+
+    b.my_method();
+}