2 files changed, 103 insertions, 102 deletions

diff --git a/crates/ra_syntax/src/ast/generated/nodes.rs b/crates/ra_syntax/src/ast/generated/nodes.rs
index 9064398a9..286be1032 100644
--- a/crates/ra_syntax/src/ast/generated/nodes.rs
+++ b/crates/ra_syntax/src/ast/generated/nodes.rs
@@ -473,6 +473,7 @@ pub struct LifetimeParam {
     pub(crate) syntax: SyntaxNode,
 }
 impl ast::AttrsOwner for LifetimeParam {}
+impl ast::TypeBoundsOwner for LifetimeParam {}
 impl LifetimeParam {
     pub fn lifetime_token(&self) -> Option<SyntaxToken> {
         support::token(&self.syntax, T![lifetime])
@@ -503,6 +504,19 @@ impl ConstParam {
     pub fn default_val(&self) -> Option<Expr> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct WherePred {
+    pub(crate) syntax: SyntaxNode,
+}
+impl ast::TypeBoundsOwner for WherePred {}
+impl WherePred {
+    pub fn for_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![for]) }
+    pub fn generic_param_list(&self) -> Option<GenericParamList> { support::child(&self.syntax) }
+    pub fn lifetime_token(&self) -> Option<SyntaxToken> {
+        support::token(&self.syntax, T![lifetime])
+    }
+    pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct Literal {
     pub(crate) syntax: SyntaxNode,
 }
@@ -520,6 +534,29 @@ impl TokenTree {
     pub fn r_brack_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![']']) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LetStmt {
+    pub(crate) syntax: SyntaxNode,
+}
+impl ast::AttrsOwner for LetStmt {}
+impl LetStmt {
+    pub fn let_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![let]) }
+    pub fn pat(&self) -> Option<Pat> { support::child(&self.syntax) }
+    pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
+    pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
+    pub fn initializer(&self) -> Option<Expr> { support::child(&self.syntax) }
+    pub fn semicolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![;]) }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ExprStmt {
+    pub(crate) syntax: SyntaxNode,
+}
+impl ast::AttrsOwner for ExprStmt {}
+impl ExprStmt {
+    pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
+    pub fn semicolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![;]) }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct ParenType {
     pub(crate) syntax: SyntaxNode,
 }
@@ -1179,42 +1216,6 @@ impl MacroStmts {
     pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct WherePred {
-    pub(crate) syntax: SyntaxNode,
-}
-impl ast::TypeBoundsOwner for WherePred {}
-impl WherePred {
-    pub fn for_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![for]) }
-    pub fn generic_param_list(&self) -> Option<GenericParamList> { support::child(&self.syntax) }
-    pub fn lifetime_token(&self) -> Option<SyntaxToken> {
-        support::token(&self.syntax, T![lifetime])
-    }
-    pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
-}
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct ExprStmt {
-    pub(crate) syntax: SyntaxNode,
-}
-impl ast::AttrsOwner for ExprStmt {}
-impl ExprStmt {
-    pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
-    pub fn semicolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![;]) }
-}
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct LetStmt {
-    pub(crate) syntax: SyntaxNode,
-}
-impl ast::AttrsOwner for LetStmt {}
-impl LetStmt {
-    pub fn let_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![let]) }
-    pub fn pat(&self) -> Option<Pat> { support::child(&self.syntax) }
-    pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
-    pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
-    pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
-    pub fn initializer(&self) -> Option<Expr> { support::child(&self.syntax) }
-    pub fn semicolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![;]) }
-}
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct PathSegment {
     pub(crate) syntax: SyntaxNode,
 }
@@ -1880,6 +1881,17 @@ impl AstNode for ConstParam {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
+impl AstNode for WherePred {
+    fn can_cast(kind: SyntaxKind) -> bool { kind == WHERE_PRED }
+    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 Literal {
     fn can_cast(kind: SyntaxKind) -> bool { kind == LITERAL }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -1902,6 +1914,28 @@ impl AstNode for TokenTree {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
+impl AstNode for LetStmt {
+    fn can_cast(kind: SyntaxKind) -> bool { kind == LET_STMT }
+    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> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+}
 impl AstNode for ParenType {
     fn can_cast(kind: SyntaxKind) -> bool { kind == PAREN_TYPE }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -2672,39 +2706,6 @@ impl AstNode for MacroStmts {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
-impl AstNode for WherePred {
-    fn can_cast(kind: SyntaxKind) -> bool { kind == WHERE_PRED }
-    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> {
-        if Self::can_cast(syntax.kind()) {
-            Some(Self { syntax })
-        } else {
-            None
-        }
-    }
-    fn syntax(&self) -> &SyntaxNode { &self.syntax }
-}
-impl AstNode for LetStmt {
-    fn can_cast(kind: SyntaxKind) -> bool { kind == LET_STMT }
-    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 PathSegment {
     fn can_cast(kind: SyntaxKind) -> bool { kind == PATH_SEGMENT }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -3671,6 +3672,11 @@ impl std::fmt::Display for ConstParam {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
+impl std::fmt::Display for WherePred {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        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)
@@ -3681,6 +3687,16 @@ impl std::fmt::Display for TokenTree {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
+impl std::fmt::Display for LetStmt {
+    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)
+    }
+}
 impl std::fmt::Display for ParenType {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
@@ -4031,21 +4047,6 @@ impl std::fmt::Display for MacroStmts {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
-impl std::fmt::Display for WherePred {
-    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)
-    }
-}
-impl std::fmt::Display for LetStmt {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        std::fmt::Display::fmt(self.syntax(), f)
-    }
-}
 impl std::fmt::Display for PathSegment {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
diff --git a/xtask/src/codegen/rust.ungram b/xtask/src/codegen/rust.ungram
index 32f2808ea..8271509cf 100644
--- a/xtask/src/codegen/rust.ungram
+++ b/xtask/src/codegen/rust.ungram
@@ -175,7 +175,13 @@ ConstParam =
   ('=' default_val:Expr)?
 
 LifetimeParam =
-  Attr* 'lifetime'
+  Attr* 'lifetime' (':' TypeBoundList?)?
+
+WhereClause =
+  'where' predicates:(WherePred (',' WherePred)* ','?)
+
+WherePred =
+  ('for' GenericParamList)?  ('lifetime' | Type) ':' TypeBoundList
 
 Visibility =
   'pub' ('('
@@ -188,6 +194,17 @@ Visibility =
 Attr =
   '#' '!'? '[' Path ('=' Literal | TokenTree)? ']'
 
+Stmt =
+  LetStmt
+| ExprStmt
+
+LetStmt =
+  Attr* 'let' Pat (':' Type)?
+  '=' initializer:Expr ';'
+
+ExprStmt =
+  Attr* Expr ';'?
+
 Type =
   ParenType
 | TupleType
@@ -450,19 +467,6 @@ MacroStmts =
   statements:Stmt*
   Expr?
 
-WherePred =
-  ('for' GenericParamList)?  ('lifetime' | Type) ':' TypeBoundList
-
-WhereClause =
-  'where' predicates:WherePred*
-
-ExprStmt =
-  Attr* Expr ';'
-
-LetStmt =
-  Attr* 'let' Pat (':' Type)
-  '=' initializer:Expr ';'
-
 Path =
   (qualifier:Path '::')? segment:PathSegment
 
@@ -490,10 +494,6 @@ LifetimeArg =
 ConstArg =
   Literal | BlockExpr BlockExpr
 
-Stmt =
-  LetStmt
-| ExprStmt
-
 Pat =
   OrPat
 | ParenPat