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Give a sensible error message when a needed annotation is missing.

This commit is contained in:
Bodil Stokke 2018-12-03 16:51:37 +00:00
parent 67c5771b4e
commit 8d7eecc21c
1 changed files with 11 additions and 1 deletions
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12
macros/src/html.rs
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@ -1,4 +1,4 @@
use proc_macro2::{Delimiter, Group, Ident, Literal, TokenStream, TokenTree};
use proc_macro2::{Delimiter, Group, Ident, Literal, Span, TokenStream, TokenTree};
use quote::{quote, quote_spanned};
use config::required_children;
@ -213,6 +213,16 @@ impl Element {
body.extend(opt_children);
for (key, value) in events.iter() {
if ty.is_none() {
let mut err = quote_spanned! { key.span() =>
compile_error! { "when using event handlers, you must declare the output type inside the html! macro" }
};
let hint = quote_spanned! { Span::call_site() =>
compile_error! { "for example: change html!(<div>...</div>) to html!(<div>...</div> : String)" }
};
err.extend(hint);
return Err(err);
}
let key = TokenTree::Ident(key.clone());
let value = process_value(value);
body.extend(quote!(