fix: allow compound literals with address-of operator

Author: Yeaseen

c2rust-transpile/src/translator/structs.rs

@@ -544,12 +544,6 @@ impl<'a> Translation<'a> {
                 Both(field_id, (field_name, _, bitfield_width, use_inner_type)) => {
                     let mut expr = self.convert_expr(ctx.used(), *field_id)?;
 
-                    if !expr.is_pure() {
-                        return Err(TranslationError::generic(
-                            "Expected no statements in field expression",
-                        ));
-                    }
-
                     if use_inner_type {
                         // See comment above
                         expr = expr.map(|fi| mk().anon_field_expr(fi, 0));

tests/structs/src/struct_with_exp.c

@@ -0,0 +1,14 @@
+
+struct s { 
+    int i; 
+};
+
+void struct_with_exp(const unsigned int buffer_size, int buffer[const]){
+    if (buffer_size < 1) return;
+    
+    struct s *p;
+    int j = 42;
+    p = &((struct s){j++}); // Compound literal with address-of operator and post-increment operator
+
+    buffer[0] = p->i;
+}

tests/structs/src/test_struct_with_exp.rs

@@ -0,0 +1,23 @@
+use crate::struct_with_exp::rust_struct_with_exp;
+use libc::{c_int, c_uint, size_t};
+
+#[link(name = "test")]
+extern "C" {
+    fn struct_with_exp(_: c_uint, _: *mut c_int);
+}
+
+const BUFFER_SIZE: usize = 1;
+
+pub fn test_struct_with_exp() {
+  let mut buffer = [0; BUFFER_SIZE];
+  let mut rust_buffer = [0; BUFFER_SIZE];
+  let expected_buffer = [42];
+
+  unsafe {
+      struct_with_exp(BUFFER_SIZE as u32, buffer.as_mut_ptr());
+      rust_struct_with_exp(BUFFER_SIZE as u32, rust_buffer.as_mut_ptr());
+  }
+
+  assert_eq!(buffer, rust_buffer);
+  assert_eq!(buffer, expected_buffer);
+}