cgen: add & before ptr arr elements (#17379)

vlib/v/gen/c/auto_str_methods.v

@@ -558,7 +558,13 @@ fn (mut g Gen) gen_str_for_array(info ast.Array, styp string, str_fn_name string
 		}
 		if should_use_indent_func(sym.kind) && !sym_has_str_method {
 			if is_elem_ptr {
-				g.auto_str_funcs.writeln('\t\tstring x = indent_${elem_str_fn_name}(*it, indent_count);')
+				deref, deref_label := deref_kind(str_method_expects_ptr, is_elem_ptr,
+					typ)
+				g.auto_str_funcs.writeln('\t\tstring x = _SLIT("nil");')
+				g.auto_str_funcs.writeln('\t\tif (it != 0) {')
+				g.auto_str_funcs.writeln('\t\t\tstrings__Builder_write_string(&sb, _SLIT("${deref_label}"));')
+				g.auto_str_funcs.writeln('\t\t\tx = ${elem_str_fn_name}(${deref}it);')
+				g.auto_str_funcs.writeln('\t\t}')
 			} else {
 				g.auto_str_funcs.writeln('\t\tstring x = indent_${elem_str_fn_name}(it, indent_count);')
 			}

vlib/v/slow_tests/inout/printing_fixed_array_of_pointers.out

@@ -53,8 +53,8 @@ StructOfFixedArraysOfListeners{
 [&0, &0]
 [&&0, &&0]
 -----------------------------------------------------
-[EventListener{
+[&EventListener{
     x: 123
-}, EventListener{
+}, &EventListener{
     x: 0
 }]

vlib/v/tests/array_of_ptrs_test.v

@@ -0,0 +1,22 @@
+struct Point {
+	x int
+	y int
+}
+
+fn test_array_of_ptr_str() {
+	point_1 := &Point{1, 2}
+	point_2 := &Point{3, 4}
+	point_3 := &Point{5, 6}
+	points := [point_1, point_2, point_3]
+	assert '${points}' == '[&Point{
+    x: 1
+    y: 2
+}, &Point{
+    x: 3
+    y: 4
+}, &Point{
+    x: 5
+    y: 6
+}]
+'.trim_indent()
+}