diff --git a/Cargo.lock b/Cargo.lock
index b99c243a47..9f013c2757 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1809,9 +1809,9 @@ checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
 
 [[package]]
 name = "ungrammar"
-version = "1.12.2"
+version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df6586a7c530704efe803d49a0b4132dcbdb4063163df39110548e6b5f2373ba"
+checksum = "76760314176cc2b94047af2f921b92c39f11a34dc05c43a3c2b0fc91cb22959f"
 
 [[package]]
 name = "unicase"
diff --git a/crates/hir_def/src/attr.rs b/crates/hir_def/src/attr.rs
index e4c84afbfa..85d01ac3e9 100644
--- a/crates/hir_def/src/attr.rs
+++ b/crates/hir_def/src/attr.rs
@@ -414,7 +414,7 @@ pub enum AttrInput {
 impl Attr {
     fn from_src(ast: ast::Attr, hygiene: &Hygiene, index: u32) -> Option<Attr> {
         let path = ModPath::from_src(ast.path()?, hygiene)?;
-        let input = if let Some(lit) = ast.literal() {
+        let input = if let Some(ast::Expr::Literal(lit)) = ast.expr() {
             let value = match lit.kind() {
                 ast::LiteralKind::String(string) => string.value()?.into(),
                 _ => lit.syntax().first_token()?.text().trim_matches('"').into(),
diff --git a/crates/ide/src/syntax_highlighting/inject.rs b/crates/ide/src/syntax_highlighting/inject.rs
index 947cc974ce..90feb6c188 100644
--- a/crates/ide/src/syntax_highlighting/inject.rs
+++ b/crates/ide/src/syntax_highlighting/inject.rs
@@ -277,9 +277,9 @@ pub(super) fn doc_comment(hl: &mut Highlights, sema: &Semantics<RootDatabase>, n
 }
 
 fn find_doc_string_in_attr(attr: &hir::Attr, it: &ast::Attr) -> Option<ast::String> {
-    match it.literal() {
+    match it.expr() {
         // #[doc = lit]
-        Some(lit) => match lit.kind() {
+        Some(ast::Expr::Literal(lit)) => match lit.kind() {
             ast::LiteralKind::String(it) => Some(it),
             _ => None,
         },
@@ -297,6 +297,7 @@ fn find_doc_string_in_attr(attr: &hir::Attr, it: &ast::Attr) -> Option<ast::Stri
                     string.text().get(1..string.text().len() - 1).map_or(false, |it| it == text)
                 })
         }
+        _ => return None,
     }
 }
 
diff --git a/crates/parser/src/grammar/attributes.rs b/crates/parser/src/grammar/attributes.rs
index dab0f62c3c..96791ffc2a 100644
--- a/crates/parser/src/grammar/attributes.rs
+++ b/crates/parser/src/grammar/attributes.rs
@@ -30,8 +30,8 @@ fn attr(p: &mut Parser, inner: bool) {
         match p.current() {
             T![=] => {
                 p.bump(T![=]);
-                if expressions::literal(p).is_none() {
-                    p.error("expected literal");
+                if expressions::expr(p).0.is_none() {
+                    p.error("expected expression");
                 }
             }
             T!['('] | T!['['] | T!['{'] => items::token_tree(p),
diff --git a/crates/syntax/src/ast/generated/nodes.rs b/crates/syntax/src/ast/generated/nodes.rs
index 6097178b6f..9a88fdb567 100644
--- a/crates/syntax/src/ast/generated/nodes.rs
+++ b/crates/syntax/src/ast/generated/nodes.rs
@@ -152,7 +152,7 @@ impl Attr {
     pub fn l_brack_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T!['[']) }
     pub fn path(&self) -> Option<Path> { support::child(&self.syntax) }
     pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
-    pub fn literal(&self) -> Option<Literal> { support::child(&self.syntax) }
+    pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
     pub fn token_tree(&self) -> Option<TokenTree> { support::child(&self.syntax) }
     pub fn r_brack_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![']']) }
 }
@@ -632,12 +632,6 @@ impl WherePred {
     pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct Literal {
-    pub(crate) syntax: SyntaxNode,
-}
-impl ast::AttrsOwner for Literal {}
-impl Literal {}
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct ExprStmt {
     pub(crate) syntax: SyntaxNode,
 }
@@ -805,6 +799,12 @@ impl IndexExpr {
     pub fn r_brack_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![']']) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Literal {
+    pub(crate) syntax: SyntaxNode,
+}
+impl ast::AttrsOwner for Literal {}
+impl Literal {}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct LoopExpr {
     pub(crate) syntax: SyntaxNode,
 }
@@ -2072,17 +2072,6 @@ impl AstNode for WherePred {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
-impl AstNode for Literal {
-    fn can_cast(kind: SyntaxKind) -> bool { kind == LITERAL }
-    fn cast(syntax: SyntaxNode) -> Option<Self> {
-        if Self::can_cast(syntax.kind()) {
-            Some(Self { syntax })
-        } else {
-            None
-        }
-    }
-    fn syntax(&self) -> &SyntaxNode { &self.syntax }
-}
 impl AstNode for ExprStmt {
     fn can_cast(kind: SyntaxKind) -> bool { kind == EXPR_STMT }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -2259,6 +2248,17 @@ impl AstNode for IndexExpr {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
+impl AstNode for Literal {
+    fn can_cast(kind: SyntaxKind) -> bool { kind == LITERAL }
+    fn cast(syntax: SyntaxNode) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+}
 impl AstNode for LoopExpr {
     fn can_cast(kind: SyntaxKind) -> bool { kind == LOOP_EXPR }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -3887,11 +3887,6 @@ impl std::fmt::Display for WherePred {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
-impl std::fmt::Display for Literal {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        std::fmt::Display::fmt(self.syntax(), f)
-    }
-}
 impl std::fmt::Display for ExprStmt {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
@@ -3972,6 +3967,11 @@ impl std::fmt::Display for IndexExpr {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
+impl std::fmt::Display for Literal {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Display::fmt(self.syntax(), f)
+    }
+}
 impl std::fmt::Display for LoopExpr {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
diff --git a/crates/syntax/src/ast/node_ext.rs b/crates/syntax/src/ast/node_ext.rs
index 0b0d39a757..5a9834cbb8 100644
--- a/crates/syntax/src/ast/node_ext.rs
+++ b/crates/syntax/src/ast/node_ext.rs
@@ -109,16 +109,6 @@ impl ast::Attr {
         Some((self.simple_name()?, tt))
     }
 
-    pub fn as_simple_key_value(&self) -> Option<(SmolStr, SmolStr)> {
-        let lit = self.literal()?;
-        let key = self.simple_name()?;
-        let value_token = lit.syntax().first_token()?;
-
-        let value: SmolStr = ast::String::cast(value_token)?.value()?.into();
-
-        Some((key, value))
-    }
-
     pub fn simple_name(&self) -> Option<SmolStr> {
         let path = self.path()?;
         match (path.segment(), path.qualifier()) {
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index ad93fbe3bd..997770958f 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -11,7 +11,7 @@ anyhow = "1.0.26"
 flate2 = "1.0"
 proc-macro2 = "1.0.8"
 quote = "1.0.2"
-ungrammar = "=1.12"
+ungrammar = "=1.13"
 walkdir = "2.3.1"
 write-json = "0.1.0"
 xshell = "0.1"