Skip to content

concise diagnostics for missing props #3873

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
Madoshakalaka merged 4 commits into from
Jul 9, 2025
Merged

concise diagnostics for missing props #3873

Show file tree
Hide file tree
Changes from 3 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
d84e9e6
concise diagnostics for missing props
Madoshakalaka Jul 6, 2025
ac43025
happy clippy
Madoshakalaka Jul 6, 2025
c273b4a
make fmt happy
Madoshakalaka Jul 6, 2025
f5f68d3
remove wrongly placed diagnostic attribute
Madoshakalaka Jul 6, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 2 additions & 2 deletions .github/workflows/main-checks.yml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,7 @@ jobs:
fail-fast: false
matrix:
toolchain:
- 1.76.0
- 1.78.0
- stable

steps:
Expand Down Expand Up @@ -120,7 +120,7 @@ jobs:
fail-fast: false
matrix:
toolchain:
- 1.76.0
- 1.78.0
- stable
- nightly

Expand Down
2 changes: 1 addition & 1 deletion examples/wasi_ssr_module/src/main.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,7 @@ pub async fn render() -> Result<String> {
#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<()> {
let ret = render().await?;
println!("{}", ret);
println!("{ret}");

Ok(())
}
2 changes: 1 addition & 1 deletion examples/web_worker_fib/src/lib.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ fn Main() -> Html {
// start the worker
let output_value = fib_agent.run(input_value).await;

output.set(format!("Fibonacci value: {}", output_value));
output.set(format!("Fibonacci value: {output_value}"));
});
}
};
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-agent-macro/Cargo.toml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
name = "yew-agent-macro"
version = "0.2.0"
edition = "2021"
rust-version = "1.76.0"
rust-version = "1.78.0"
authors = ["Kaede Hoshikawa <[email protected]>"]
repository = "https://github.com/yewstack/yew"
homepage = "https://yew.rs"
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-agent/Cargo.toml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ edition = "2021"
readme = "../../README.md"
description = "Agents for Yew"
license = "MIT OR Apache-2.0"
rust-version = "1.76.0"
rust-version = "1.78.0"

[dependencies]
yew = { version = "0.21.0", path = "../yew" }
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/Cargo.toml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@ license = "MIT OR Apache-2.0"
keywords = ["web", "wasm", "frontend", "webasm", "webassembly"]
categories = ["gui", "web-programming", "wasm"]
description = "A framework for making client-side single-page apps"
rust-version = "1.76.0"
rust-version = "1.78.0"

[lib]
proc-macro = true
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/Makefile.toml
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
[tasks.test]
clear = true
toolchain = "1.76.0"
toolchain = "1.78.0"
command = "cargo"
# test target can be optionally specified like `cargo make test html_macro`,
args = ["test", "${@}"]
Expand Down
3 changes: 3 additions & 0 deletions packages/yew-macro/src/derive_props/builder.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,7 @@ impl PropsBuilder<'_> {
quote! {
#[automatically_derived]
#( #extra_attrs )*
#[diagnostic::do_not_recommend]
impl #builder_impl_generics #builder_name<#generic_args> #builder_where_clause {
#( #prop_fns )*
}
Expand All @@ -142,11 +143,13 @@ impl PropsBuilder<'_> {
#vis struct #check_all_props_name<How>(::std::marker::PhantomData<How>);

#[automatically_derived]
#[diagnostic::do_not_recommend]
impl<B, P, How> ::yew::html::HasProp<P, &dyn ::yew::html::HasProp<P, How>>
for #check_all_props_name<B>
where B: ::yew::html::HasProp<P, How> {}

#[automatically_derived]
#[diagnostic::do_not_recommend]
impl #check_impl_generics ::yew::html::HasAllProps<
#props_name #ty_generics ,
( #( #check_args , )* ),
Expand Down
3 changes: 3 additions & 0 deletions packages/yew-macro/src/derive_props/field.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -245,9 +245,12 @@ impl PropFieldCheck<'_> {
#vis struct #check_struct<How>(::std::marker::PhantomData<How>);

#[automatically_derived]
#[diagnostic::do_not_recommend]
impl<B> ::yew::html::HasProp< #prop_name_mod :: #prop_check_name, #check_struct<B>>
for #check_struct<B> {}

#[automatically_derived]
#[diagnostic::do_not_recommend]
impl<B, P, How> ::yew::html::HasProp<P, &dyn ::yew::html::HasProp<P, How>>
for #check_struct<B>
where B: ::yew::html::HasProp<P, How> {}
Expand Down
24 changes: 12 additions & 12 deletions packages/yew-macro/tests/classes_macro/classes-fail.stderr
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,11 @@ error[E0277]: the trait bound `Classes: From<{integer}>` is not satisfied
--> tests/classes_macro/classes-fail.rs:4:14
|
4 | classes!(42);
| ^^ the trait `From<{integer}>` is not implemented for `Classes`
| ^^ the trait `From<{integer}>` is not implemented for `Classes`, which is required by `{integer}: Into<Classes>`
|
= help: the following other types implement trait `From<T>`:
<Classes as From<Cow<'static, str>>>
<Classes as From<implicit_clone::unsync::string::IString>>
<Classes as From<Cow<'static, str>>>
<Classes as From<Vec<T>>>
<Classes as From<String>>
<Classes as From<Option<T>>>
Expand All @@ -37,11 +37,11 @@ error[E0277]: the trait bound `Classes: From<{float}>` is not satisfied
--> tests/classes_macro/classes-fail.rs:5:14
|
5 | classes!(42.0);
| ^^^^ the trait `From<{float}>` is not implemented for `Classes`
| ^^^^ the trait `From<{float}>` is not implemented for `Classes`, which is required by `{float}: Into<Classes>`
|
= help: the following other types implement trait `From<T>`:
<Classes as From<Cow<'static, str>>>
<Classes as From<implicit_clone::unsync::string::IString>>
<Classes as From<Cow<'static, str>>>
<Classes as From<Vec<T>>>
<Classes as From<String>>
<Classes as From<Option<T>>>
Expand All @@ -62,12 +62,12 @@ error[E0277]: the trait bound `Classes: From<{integer}>` is not satisfied
9 | classes!(vec![42]);
| ---^^^^^
| |
| the trait `From<{integer}>` is not implemented for `Classes`
| the trait `From<{integer}>` is not implemented for `Classes`, which is required by `Vec<{integer}>: Into<Classes>`
| required by a bound introduced by this call
|
= help: the following other types implement trait `From<T>`:
<Classes as From<Cow<'static, str>>>
<Classes as From<implicit_clone::unsync::string::IString>>
<Classes as From<Cow<'static, str>>>
<Classes as From<Vec<T>>>
<Classes as From<String>>
<Classes as From<Option<T>>>
Expand All @@ -89,11 +89,11 @@ error[E0277]: the trait bound `Classes: From<{integer}>` is not satisfied
--> tests/classes_macro/classes-fail.rs:13:14
|
13 | classes!(some);
| ^^^^ the trait `From<{integer}>` is not implemented for `Classes`
| ^^^^ the trait `From<{integer}>` is not implemented for `Classes`, which is required by `Option<{integer}>: Into<Classes>`
|
= help: the following other types implement trait `From<T>`:
<Classes as From<Cow<'static, str>>>
<Classes as From<implicit_clone::unsync::string::IString>>
<Classes as From<Cow<'static, str>>>
<Classes as From<Vec<T>>>
<Classes as From<String>>
<Classes as From<Option<T>>>
Expand All @@ -115,11 +115,11 @@ error[E0277]: the trait bound `Classes: From<u32>` is not satisfied
--> tests/classes_macro/classes-fail.rs:14:14
|
14 | classes!(none);
| ^^^^ the trait `From<u32>` is not implemented for `Classes`
| ^^^^ the trait `From<u32>` is not implemented for `Classes`, which is required by `Option<u32>: Into<Classes>`
|
= help: the following other types implement trait `From<T>`:
<Classes as From<Cow<'static, str>>>
<Classes as From<implicit_clone::unsync::string::IString>>
<Classes as From<Cow<'static, str>>>
<Classes as From<Vec<T>>>
<Classes as From<String>>
<Classes as From<Option<T>>>
Expand All @@ -141,11 +141,11 @@ error[E0277]: the trait bound `Classes: From<{integer}>` is not satisfied
--> tests/classes_macro/classes-fail.rs:16:21
|
16 | classes!("one", 42);
| ^^ the trait `From<{integer}>` is not implemented for `Classes`
| ^^ the trait `From<{integer}>` is not implemented for `Classes`, which is required by `{integer}: Into<Classes>`
|
= help: the following other types implement trait `From<T>`:
<Classes as From<Cow<'static, str>>>
<Classes as From<implicit_clone::unsync::string::IString>>
<Classes as From<Cow<'static, str>>>
<Classes as From<Vec<T>>>
<Classes as From<String>>
<Classes as From<Option<T>>>
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/tests/classes_macro_test.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
#[allow(dead_code)]
#[rustversion::attr(stable(1.76), test)]
#[rustversion::attr(stable(1.78), test)]
fn classes_macro() {
let t = trybuild::TestCases::new();
t.pass("tests/classes_macro/*-pass.rs");
Expand Down
44 changes: 18 additions & 26 deletions packages/yew-macro/tests/derive_props/fail.stderr
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -61,22 +61,14 @@ help: consider annotating `Value` with `#[derive(PartialEq)]`
9 | struct Value;
|

error[E0277]: the trait bound `AssertAllProps: HasProp<t3::_Props::value, _>` is not satisfied
error[E0277]: not all required properties have been provided
--> tests/derive_props/fail.rs:35:24
|
35 | ::yew::props!{ Props { } };
| ^^^^^ the trait `HasProp<t3::_Props::value, _>` is not implemented for `AssertAllProps`
|
= help: the following other types implement trait `HasProp<P, How>`:
<t1::CheckPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
<t2::HasPropsvalue<B> as HasProp<t2::_Props::value, t2::HasPropsvalue<B>>>
<t2::HasPropsvalue<B> as HasProp<P, &dyn HasProp<P, How>>>
<t2::CheckPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
<t3::HasPropsvalue<B> as HasProp<t3::_Props::value, t3::HasPropsvalue<B>>>
<t3::HasPropsvalue<B> as HasProp<P, &dyn HasProp<P, How>>>
<t3::CheckPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
<t4::HasPropsvalue<B> as HasProp<t4::_Props::value, t4::HasPropsvalue<B>>>
and $N others
| ^^^^^ missing required properties for this component
|
= help: the trait `HasProp<t3::_Props::value, _>` is not implemented for `AssertAllProps`, which is required by `AssertAllProps: AllPropsFor<t3::PropsBuilder, _>`
= note: make sure all required properties are set before building the component
note: required for `t3::CheckPropsAll<AssertAllProps>` to implement `HasAllProps<t3::Props, (_,)>`
--> tests/derive_props/fail.rs:29:21
|
Expand All @@ -93,22 +85,14 @@ note: required by a bound in `html::component::properties::__macro::PreBuild::<T
| ^^^^^^^^^^^^^^^^^^^ required by this bound in `PreBuild::<Token, B>::build`
= note: this error originates in the derive macro `Properties` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: the trait bound `AssertAllProps: HasProp<t4::_Props::value, _>` is not satisfied
error[E0277]: not all required properties have been provided
--> tests/derive_props/fail.rs:47:24
|
47 | ::yew::props!{ Props { } };
| ^^^^^ the trait `HasProp<t4::_Props::value, _>` is not implemented for `AssertAllProps`
|
= help: the following other types implement trait `HasProp<P, How>`:
<t1::CheckPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
<t2::HasPropsvalue<B> as HasProp<t2::_Props::value, t2::HasPropsvalue<B>>>
<t2::HasPropsvalue<B> as HasProp<P, &dyn HasProp<P, How>>>
<t2::CheckPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
<t3::HasPropsvalue<B> as HasProp<t3::_Props::value, t3::HasPropsvalue<B>>>
<t3::HasPropsvalue<B> as HasProp<P, &dyn HasProp<P, How>>>
<t3::CheckPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
<t4::HasPropsvalue<B> as HasProp<t4::_Props::value, t4::HasPropsvalue<B>>>
and $N others
| ^^^^^ missing required properties for this component
|
= help: the trait `HasProp<t4::_Props::value, _>` is not implemented for `AssertAllProps`, which is required by `AssertAllProps: AllPropsFor<t4::PropsBuilder, _>`
= note: make sure all required properties are set before building the component
note: required for `t4::CheckPropsAll<AssertAllProps>` to implement `HasAllProps<t4::Props, (_,)>`
--> tests/derive_props/fail.rs:41:21
|
Expand Down Expand Up @@ -168,3 +152,11 @@ error[E0271]: expected `foo` to be a fn item that returns `String`, but it retur
|
note: required by a bound in `Option::<T>::unwrap_or_else`
--> $RUST/core/src/option.rs

warning: unused variable: `bar`
--> tests/derive_props/fail.rs:100:12
|
100 | fn foo(bar: i32) -> String {
| ^^^ help: if this is intentional, prefix it with an underscore: `_bar`
|
= note: `#[warn(unused_variables)]` on by default
1 change: 0 additions & 1 deletion packages/yew-macro/tests/derive_props/pass.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
#![no_implicit_prelude]
#![recursion_limit = "128"]

// Shadow primitives
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/tests/derive_props_test.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
#[allow(dead_code)]
#[rustversion::attr(stable(1.76), test)]
#[rustversion::attr(stable(1.78), test)]
fn derive_props() {
let t = trybuild::TestCases::new();
t.pass("tests/derive_props/pass.rs");
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/tests/function_attr_test.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
#[allow(dead_code)]
#[rustversion::attr(stable(1.76), test)]
#[rustversion::attr(stable(1.78), test)]
fn tests() {
let t = trybuild::TestCases::new();
t.pass("tests/function_component_attr/*-pass.rs");
Expand Down
1 change: 0 additions & 1 deletion packages/yew-macro/tests/function_component_attr/generic-pass.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
#![no_implicit_prelude]

// Shadow primitives
#[allow(non_camel_case_types)]
Expand Down
23 changes: 10 additions & 13 deletions packages/yew-macro/tests/function_component_attr/generic-props-fail.stderr
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,22 +9,14 @@ help: you might be missing a type parameter
20 | fn compile_fail<INVALID>() {
| +++++++++

error[E0277]: the trait bound `AssertAllProps: HasProp<a, _>` is not satisfied
error[E0277]: not all required properties have been provided
--> tests/function_component_attr/generic-props-fail.rs:22:14
|
22 | html! { <Comp<Props> /> };
| ^^^^ the trait `HasProp<a, _>` is not implemented for `AssertAllProps`
|
= help: the following other types implement trait `HasProp<P, How>`:
<HasPropsa<B> as HasProp<a, HasPropsa<B>>>
<HasPropsa<B> as HasProp<P, &dyn HasProp<P, How>>>
<CheckPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
<HasContextProviderPropscontext<B> as HasProp<yew::context::_ContextProviderProps::context, HasContextProviderPropscontext<B>>>
<HasContextProviderPropscontext<B> as HasProp<P, &dyn HasProp<P, How>>>
<HasContextProviderPropschildren<B> as HasProp<children, HasContextProviderPropschildren<B>>>
<HasContextProviderPropschildren<B> as HasProp<P, &dyn HasProp<P, How>>>
<CheckContextProviderPropsAll<B> as HasProp<P, &dyn HasProp<P, How>>>
and $N others
| ^^^^ missing required properties for this component
|
= help: the trait `HasProp<a, _>` is not implemented for `AssertAllProps`, which is required by `AssertAllProps: AllPropsFor<PropsBuilder, _>`
= note: make sure all required properties are set before building the component
note: required for `CheckPropsAll<AssertAllProps>` to implement `HasAllProps<Props, (_,)>`
--> tests/function_component_attr/generic-props-fail.rs:3:17
|
Expand Down Expand Up @@ -80,6 +72,11 @@ error[E0599]: the function or associated item `new` exists for struct `VChild<Co
27 | html! { <Comp<MissingTypeBounds> /> };
| ^^^^ function or associated item cannot be called on `VChild<Comp<MissingTypeBounds>>` due to unsatisfied trait bounds
|
note: if you're trying to build a new `VChild<Comp<MissingTypeBounds>>`, consider using `VChild::<COMP>::new` which returns `VChild<_>`
--> $WORKSPACE/packages/yew/src/virtual_dom/vcomp.rs
|
| pub fn new(props: COMP::Properties, key: Option<Key>) -> Self {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: the following trait bounds were not satisfied:
`Comp<MissingTypeBounds>: yew::BaseComponent`
note: the trait `yew::BaseComponent` must be implemented
Expand Down
1 change: 0 additions & 1 deletion packages/yew-macro/tests/function_component_attr/hook_location-pass.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
#![no_implicit_prelude]

#[derive(
::std::prelude::rust_2021::Debug,
Expand Down
1 change: 0 additions & 1 deletion packages/yew-macro/tests/function_component_attr/no-name-default-pass.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
#![no_implicit_prelude]

#[derive(::yew::prelude::Properties, ::std::prelude::rust_2021::PartialEq,)]
struct Props {
Expand Down
1 change: 0 additions & 1 deletion packages/yew-macro/tests/function_component_attr/with-defaulted-type-param-pass.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
#![no_implicit_prelude]
Copy link
Member Author

@Madoshakalaka Madoshakalaka Jul 6, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I removed these from the tests that have #[derive(Properties)] because it prevents #[diagnostics] from being used. I have no clue how to qualify diagnostics with no_implicit_prelude. If anybody can help it's very appreciated.

Copy link
Member Author

@Madoshakalaka Madoshakalaka Jul 6, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Hmm.. I think it's impossible to use no_implicit_prelude together with diagnostic

https://doc.rust-lang.org/reference/attributes.html#r-attributes.tool.prelude

Tool attributes are not available if the no_implicit_prelude attribute is used.

Copy link
Member Author

@Madoshakalaka Madoshakalaka Jul 8, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I think no_implicit_prelude was introduced to improve hygiene, it ensures our macros don't accidentally collide with rust's built-in ones, which could cause false passes in macro tests.

Sadly there seems to be no way around it for now and diagnostic improvements seem worth it.


#[derive(::yew::prelude::Properties, ::std::fmt::Debug)]
pub struct CompProps<A> {
Expand Down
2 changes: 0 additions & 2 deletions packages/yew-macro/tests/function_component_attr/with-props-pass.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,3 @@
#![no_implicit_prelude]

// Shadow primitives
#[allow(non_camel_case_types)]
pub struct bool;
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/tests/hook_attr_test.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
#[allow(dead_code)]
#[rustversion::attr(stable(1.76), test)]
#[rustversion::attr(stable(1.78), test)]
fn tests() {
let t = trybuild::TestCases::new();
t.pass("tests/hook_attr/*-pass.rs");
Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/tests/hook_macro_test.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
#[allow(dead_code)]
#[rustversion::attr(stable(1.76), test)]
#[rustversion::attr(stable(1.78), test)]
fn tests() {
let t = trybuild::TestCases::new();
t.pass("tests/hook_macro/*-pass.rs");
Expand Down
12 changes: 4 additions & 8 deletions packages/yew-macro/tests/html_macro/block-fail.stderr
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,28 +1,24 @@
error[E0277]: `()` doesn't implement `std::fmt::Display`
error[E0277]: the trait bound `(): Into<NodeSeq<(), VNode>>` is not satisfied
--> tests/html_macro/block-fail.rs:6:15
|
6 | { () }
| ^^
| |
| `()` cannot be formatted with the default formatter
| the trait `std::fmt::Display` is not implemented for `()`, which is required by `(): Into<NodeSeq<_, _>>`
| required by a bound introduced by this call
|
= help: the trait `std::fmt::Display` is not implemented for `()`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
= note: required for `()` to implement `ToString`
= note: required for `VNode` to implement `From<()>`
= note: required for `()` to implement `Into<VNode>`
= note: 2 redundant requirements hidden
= note: required for `()` to implement `Into<NodeSeq<(), VNode>>`

error[E0277]: `()` doesn't implement `std::fmt::Display`
error[E0277]: the trait bound `(): Into<VNode>` is not satisfied
--> tests/html_macro/block-fail.rs:15:17
|
15 | <>{ for (0..3).map(|_| not_tree()) }</>
| ^^^^^^ `()` cannot be formatted with the default formatter
| ^^^^^^ the trait `std::fmt::Display` is not implemented for `()`, which is required by `(): Into<_>`
|
= help: the trait `std::fmt::Display` is not implemented for `()`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
= note: required for `()` to implement `ToString`
= note: required for `VNode` to implement `From<()>`
= note: required for `()` to implement `Into<VNode>`
Expand Down
Loading
Loading