cgen: fix code for unwrap option on print (#17545)

vlib/v/gen/c/fn.v

@@ -1482,6 +1482,10 @@ fn (mut g Gen) fn_call(node ast.CallExpr) {
 								typ = cast_sym.info.types[g.aggregate_type_idx]
 							}
 						}
+						// handling println( var or { ... })
+						if typ.has_flag(.option) && expr.or_expr.kind != .absent {
+							typ = typ.clear_flag(.option)
+						}
 					}
 				}
 				g.gen_expr_to_string(expr, typ)

vlib/v/tests/option_unwrap_print_test.v

@@ -0,0 +1,8 @@
+fn test_main() {
+	var := ?int(none)
+	println(var or { 100 })
+	println(var or { 100 })
+	assert dump(var or { 100 }) == 100
+	assert dump(var or { 100 }) == 100
+	assert true
+}