add test for parse errors

src/lang.zig

@@ -507,6 +507,7 @@ pub const Lang = struct {
         self.has_error = false;
         self.line = 0;
     }
+
     fn doError(self: *Lang, comptime fmt: []const u8, args: anytype) void {
         std.debug.warn("ERROR! at line {}: ", .{self.line});
         std.debug.warn(fmt, args);
@@ -700,3 +701,20 @@ test "load, phaser, quicksave" {
     std.testing.expectEqual(cmds.list.items[1].tag, .phaser);
     std.testing.expectEqual(cmds.list.items[2].tag, .quicksave);
 }
+
+test "load, phaser with errors, quicksave" {
+    var lang = Lang.init(std.testing.allocator);
+    defer lang.deinit();
+
+    const prog =
+        \\load :0;
+        \\phaser 3 1 25;
+        \\quicksave;
+    ;
+
+    var cmds = lang.parse(prog) catch |err| {
+        return;
+    };
+
+    unreachable;
+}