DO NOT MERGE: add a hello-world under src/ to test the rust integration

src/helloworld.rs

+// This is a comment, and is ignored by the compiler
+// You can test this code by clicking the "Run" button over there ->
+// or if you prefer to use your keyboard, you can use the "Ctrl + Enter" shortcut
+
+// This code is editable, feel free to hack it!
+// You can always return to the original code by clicking the "Reset" button ->
+
+// This is the main function
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+}

src/meson.build

@@ -129,3 +129,8 @@ if with_glx != 'disabled' and not with_glvnd
     variables : ['glx_tls=@0@'.format(use_elf_tls ? 'yes' : 'no')],
   )
 endif
+
+if add_languages('rust', required : false)
+  executable('helloworld',
+             'helloworld.rs')
+endif