cgen: fix push operation on array of option (#17658)

vlib/v/gen/c/auto_str_methods.v

@@ -585,7 +585,10 @@ fn (mut g Gen) gen_str_for_array(info ast.Array, styp string, str_fn_name string
 			// Rune are managed at this level as strings
 			g.auto_str_funcs.writeln('\t\tstring x = str_intp(2, _MOV((StrIntpData[]){{_SLIT("\`"), ${c.si_s_code}, {.d_s = ${elem_str_fn_name}(it) }}, {_SLIT("\`"), 0, {.d_c = 0 }}}));\n')
 		} else if sym.kind == .string {
-			if is_elem_ptr {
+			if typ.has_flag(.option) {
+				func := g.get_str_fn(typ)
+				g.auto_str_funcs.writeln('\t\tstring x = ${func}(it);\n')
+			} else if is_elem_ptr {
 				g.auto_str_funcs.writeln('\t\tstring x = str_intp(2, _MOV((StrIntpData[]){{_SLIT("&\'"), ${c.si_s_code}, {.d_s = *it }}, {_SLIT("\'"), 0, {.d_c = 0 }}}));\n')
 			} else {
 				g.auto_str_funcs.writeln('\t\tstring x = str_intp(2, _MOV((StrIntpData[]){{_SLIT("\'"), ${c.si_s_code}, {.d_s = it }}, {_SLIT("\'"), 0, {.d_c = 0 }}}));\n')

vlib/v/gen/c/infix.v

@@ -794,8 +794,12 @@ fn (mut g Gen) infix_expr_left_shift_op(node ast.InfixExpr) {
 			} else {
 				g.write(', _MOV((${elem_type_str}[]){ ')
 			}
+			if array_info.elem_type.has_flag(.option) {
+				g.expr_with_opt(node.right, node.right_type, array_info.elem_type)
+			} else {
 				// if g.autofree
-			needs_clone := !g.is_builtin_mod && array_info.elem_type.idx() == ast.string_type_idx
+				needs_clone := !g.is_builtin_mod
+					&& array_info.elem_type.idx() == ast.string_type_idx
 					&& array_info.elem_type.nr_muls() == 0
 				if needs_clone {
 					g.write('string_clone(')
@@ -804,6 +808,7 @@ fn (mut g Gen) infix_expr_left_shift_op(node ast.InfixExpr) {
 				if needs_clone {
 					g.write(')')
 				}
+			}
 			if elem_is_array_var {
 				g.write(')')
 			} else {

vlib/v/tests/option_push_array_opt_test.v

@@ -0,0 +1,15 @@
+fn test_dump_array_opt_push_string() {
+	mut vals := []?string{cap: 4}
+	vals << none
+	vals << 'a'
+	vals << 'b'
+	vals << 'c'
+
+	t := dump(vals[0])
+	assert t == none
+
+	t2 := vals[0]
+	assert t2 == none
+
+	assert vals.len == 4
+}