error: no rules expected the token `tmpl`

[Txuritan]

As a prenote I only have a general idea of how rust works and are making a web site/server to learn it.

I have multiple functions that return Box<RenderBox> that are later used in a function that returns the rendered string.

Version: 0.6.2

Log

error: no rules expected the token `tmpl`
   --> src\resources\partials\element.rs:131:5
    |
131 | /     box_html! {
132 | |         nav(class="nav nav_top full_width") {
133 | |             ul(class="nav__menu flex flex--nowrap flex__center wrapper") {
134 | |                 li(class="nav__items--container") {
...   |
151 | |         }
152 | |     }
    | |_____^
    |
    = note: this error originates in a macro outside of the current crate

Code

    box_html! {
        nav(class="nav nav_top full_width") {
            ul(class="nav__menu flex flex--nowrap flex__center wrapper") {
                li(class="nav__items--container") {
                    ul(class="nav__items--list flex flex--nowrap") {
                        li(class="flex__item") {
                            a(href="/", class="nav__link") {
                                : "Story";
                                b : "Archive";
                            }
                        }
                        : navbar_item(item_grow)
                        @ if navbar_drawer {
                            : navbar_drawer(drawer);
                        } else {
                            : navbar_item(item_login);
                        }
                    }
                }
            }
        }
    }

[Stebalien]

You're missing a semicolon before @ if nabar_drawer (what, you wanted a nice error message?). In the past, issuing compiler errors from macros was impossible so I didn't even bother trying to handle error cases nicely but that has since changed with the introduction of the compile_error macro so I'll open an issue for sane errors.

[Stebalien]

#18

[Txuritan]

Thank you that fixed it, I though I got all those. I also never knew that macros couldn't have error handling, but yes having any type of error handling would be nice other than the 'it failed' kind it has now.

[Stebalien]

They can now but it's still very difficult. For example, there's no way to get the line on which a token occurs in a macro (as far as I know at least).

Note: This only applies to declarative macros (like horrorshow). Procedural macros are a lot more flexible (they're just procedural code).

[Txuritan]

Perhaps it could be done by the render, like it walks through and if it finds something that breaks then it takes note of it and logs it.

[Stebalien]

Unfortunately not. That happens at run-time but macro syntax errors happen at compile time.