diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 47e2e0c..fa65a04 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -3,23 +3,51 @@ name: Build
 on: [push, pull_request]
 
 jobs:
-  build:
-    name: ${{ matrix.os }} - ${{ matrix.rust }}
+  clippy:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        rust: [stable, nightly]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+          components: clippy
+      - run: cargo clippy --workspace --no-default-features
+      - run: cargo clippy --workspace --all-features
+
+  fmt:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        rust: [nightly]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+          components: rustfmt
+      - run: cargo fmt --all -- --check
+
+  test:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        rust: [stable, nightly, 1.65.0]
+        rust: [stable, nightly, '1.65.0']
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
-          components: clippy, rustfmt
-      - run: cargo build
-      - run: cargo test
-      - run: cargo test --features itoa
-        working-directory: markup
-      - run: cargo fmt -- --check
-        if: ${{ matrix.os == 'ubuntu-latest' }}
-      - run: cargo clippy --all-targets
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-hack
+      - run: cargo generate-lockfile -Zminimal-versions
+        env:
+          RUSTC_BOOTSTRAP: 1
+        if: ${{ matrix.rust == '1.65.0' }}
+      - run: cargo hack test --workspace --feature-powerset --optional-deps
diff --git a/markup-proc-macro/src/ast.rs b/markup-proc-macro/src/ast.rs
index a88a666..93bd1c4 100644
--- a/markup-proc-macro/src/ast.rs
+++ b/markup-proc-macro/src/ast.rs
@@ -30,8 +30,7 @@ pub struct Element {
     pub id: Option<syn::Expr>,
     pub classes: Vec<syn::Expr>,
     pub attributes: Vec<Attribute>,
-    pub children: Vec<Node>,
-    pub close: bool,
+    pub children: Option<Vec<Node>>,
 }
 
 #[derive(Debug)]
diff --git a/markup-proc-macro/src/generate.rs b/markup-proc-macro/src/generate.rs
index de8a367..1609043 100644
--- a/markup-proc-macro/src/generate.rs
+++ b/markup-proc-macro/src/generate.rs
@@ -125,7 +125,6 @@ impl Generate for Element {
             classes,
             attributes,
             children,
-            close,
         } = self;
         stream.raw("<");
         stream.expr(name, writer);
@@ -203,14 +202,14 @@ impl Generate for Element {
             }
         }
 
-        stream.raw(">");
-
-        children.generate(stream, writer);
-
-        if *close {
+        if let Some(children) = children {
+            stream.raw(">");
+            children.generate(stream, writer);
             stream.raw("</");
             stream.expr(name, writer);
             stream.raw(">");
+        } else {
+            stream.raw(" />");
         }
     }
 }
diff --git a/markup-proc-macro/src/parse.rs b/markup-proc-macro/src/parse.rs
index a3d574a..e836aec 100644
--- a/markup-proc-macro/src/parse.rs
+++ b/markup-proc-macro/src/parse.rs
@@ -165,21 +165,19 @@ impl Parse for Element {
             }
         };
 
-        let (children, close) = {
+        let children = {
             let lookahead = input.lookahead1();
             if lookahead.peek(syn::token::Semi) {
                 let _: syn::Token![;] = input.parse()?;
-                (Vec::new(), false)
+                None
             } else if lookahead.peek(syn::token::Brace) {
                 let children;
                 syn::braced!(children in input);
-                (children.parse::<Many<_>>()?.0, true)
+                let Many(children) = children.parse()?;
+                Some(children)
             } else if lookahead.peek(syn::LitStr) {
                 let string = input.parse::<syn::LitStr>()?;
-                (
-                    vec![syn::parse_quote_spanned!(string.span() => #string)],
-                    true,
-                )
+                Some(vec![syn::parse_quote_spanned!(string.span() => #string)])
             } else {
                 return Err(lookahead.error());
             }
@@ -191,7 +189,6 @@ impl Parse for Element {
             classes,
             attributes,
             children,
-            close,
         })
     }
 }
diff --git a/markup/src/lib.rs b/markup/src/lib.rs
index d87f171..2bdaf6f 100644
--- a/markup/src/lib.rs
+++ b/markup/src/lib.rs
@@ -121,7 +121,7 @@ impl<T: std::fmt::Display> Render for Raw<T> {
 impl<T: std::fmt::Display> RenderAttributeValue for Raw<T> {}
 
 #[inline]
-pub fn raw(value: impl std::fmt::Display) -> impl Render + RenderAttributeValue {
+pub fn raw(value: impl std::fmt::Display) -> impl RenderAttributeValue {
     Raw(value)
 }
 
@@ -222,8 +222,10 @@ tuple_impl! { A B C D E F G H }
 tuple_impl! { A B C D E F G H I }
 tuple_impl! { A B C D E F G H I J }
 
+pub type RenderFn<'a> = dyn Fn(&mut dyn std::fmt::Write) -> std::fmt::Result + 'a;
+
 pub struct DynRender<'a> {
-    f: Box<dyn Fn(&mut dyn std::fmt::Write) -> std::fmt::Result + 'a>,
+    f: Box<RenderFn<'a>>,
 }
 
 pub fn new<'a, F>(f: F) -> DynRender<'a>
diff --git a/markup/tests/tests.rs b/markup/tests/tests.rs
index 0ca768d..c58e95d 100644
--- a/markup/tests/tests.rs
+++ b/markup/tests/tests.rs
@@ -55,7 +55,7 @@ t! {
             br;
         }
     },
-    A {} => "<div></div><br>",
+    A {} => "<div></div><br />",
 }
 
 t! {
@@ -100,7 +100,7 @@ t! {
         }
     },
     A {} => r#"<foo id="bar"><baz id="foo" class="quux 1 5"></baz><bar id="4" class="-1">7</bar></foo>"#,
-    B {} => r#"<foo>bar</foo><foo id="bar">baz</foo><foo class="bar" baz>quux</foo><foo class="bar" baz>quux"#,
+    B {} => r#"<foo>bar</foo><foo id="bar">baz</foo><foo class="bar" baz>quux</foo><foo class="bar" baz />quux"#,
     C {} => r#"<foo fn mod move></foo>"#,
 }
 
@@ -132,7 +132,7 @@ t! {
             br[k = 6];
         }
     },
-    A {} => r#"<div a="1" b="2" c c2 c3 c4 e-f="3" g-h="4" j="5" j2="5" j3="5" h="678truefalse" i="foo"></div><br k="6">"#,
+    A {} => r#"<div a="1" b="2" c c2 c3 c4 e-f="3" g-h="4" j="5" j2="5" j3="5" h="678truefalse" i="foo"></div><br k="6" />"#,
 }
 
 t! {
@@ -338,8 +338,8 @@ t! {
             ${name} {}
         }
     },
-    A {} => r#"<foo-bar><foo-bar></foo-bar><foo-bar baz="quux"></foo-bar>"#,
-    B { name: "foo-bar" } => r#"<foo-bar><foo-bar></foo-bar>"#,
+    A {} => r#"<foo-bar /><foo-bar></foo-bar><foo-bar baz="quux"></foo-bar>"#,
+    B { name: "foo-bar" } => r#"<foo-bar /><foo-bar></foo-bar>"#,
 }
 
 mod inner {
@@ -358,7 +358,7 @@ t! {
     t15,
     {
         A() {
-            @for | Ok(x) | Err(x) in vec![Ok(1), Err(2), Ok(3)] {
+            @for | Ok(x) | Err(x) in [Ok(1), Err(2), Ok(3)] {
                 @x
             }
         }
diff --git a/ui-tests/fail-1.78/not-render.rs b/ui-tests/fail-1.78/not-render.rs
new file mode 100644
index 0000000..d13c0e1
--- /dev/null
+++ b/ui-tests/fail-1.78/not-render.rs
@@ -0,0 +1,16 @@
+struct NotRender;
+
+markup::define! {
+    Layout(name: NotRender) {
+        @markup::doctype()
+        html["attr-user"=name] {
+            body {
+                strong { "Hello " @name "!" }
+            }
+        }
+    }
+}
+
+fn main() {
+
+}
diff --git a/ui-tests/fail-1.78/not-render.stderr b/ui-tests/fail-1.78/not-render.stderr
new file mode 100644
index 0000000..d92da9f
--- /dev/null
+++ b/ui-tests/fail-1.78/not-render.stderr
@@ -0,0 +1,35 @@
+error[E0277]: the trait bound `NotRender: RenderAttributeValue` is not satisfied
+ --> fail-1.78/not-render.rs:6:26
+  |
+6 |         html["attr-user"=name] {
+  |                          ^^^^ the trait `RenderAttributeValue` is not implemented for `NotRender`, which is required by `&NotRender: RenderAttributeValue`
+  |
+  = help: the following other types implement trait `RenderAttributeValue`:
+            bool
+            char
+            isize
+            i8
+            i16
+            i32
+            i64
+            i128
+          and $N others
+  = note: required for `&NotRender` to implement `RenderAttributeValue`
+
+error[E0277]: the trait bound `NotRender: Render` is not satisfied
+ --> fail-1.78/not-render.rs:8:36
+  |
+8 |                 strong { "Hello " @name "!" }
+  |                                    ^^^^ the trait `Render` is not implemented for `NotRender`, which is required by `&NotRender: Render`
+  |
+  = help: the following other types implement trait `Render`:
+            bool
+            char
+            isize
+            i8
+            i16
+            i32
+            i64
+            i128
+          and $N others
+  = note: required for `&NotRender` to implement `Render`
diff --git a/ui-tests/src/lib.rs b/ui-tests/src/lib.rs
index b2b5415..97fa05a 100644
--- a/ui-tests/src/lib.rs
+++ b/ui-tests/src/lib.rs
@@ -6,7 +6,9 @@ fn ui() {
     let fail = trybuild::TestCases::new();
     if version.minor <= 65 {
         fail.compile_fail("fail-1.65/*.rs");
-    } else {
+    } else if version.minor <= 77 {
         fail.compile_fail("fail-1.72/*.rs");
+    } else {
+        fail.compile_fail("fail-1.78/*.rs");
     }
 }