Add support for yiled keyword

2025-01-12 21:28:51 +00:00 · 2021-01-14 00:01:50 +09:00 · 2021-01-14 00:01:50 +09:00 · 85cd3524e2
commit 85cd3524e2
parent d9b1fa6da3
8 changed files with 95 additions and 27 deletions
--- a/crates/assists/src/handlers/inline_local_variable.rs
+++ b/crates/assists/src/handlers/inline_local_variable.rs
@ -79,29 +79,30 @@ pub(crate) fn inline_local_variable(acc: &mut Assists, ctx: &AssistContext) -> O
                None => return Ok(false),
            };

-            Ok(!matches!((&initializer_expr, usage_parent),
+            Ok(!matches!(
+                (&initializer_expr, usage_parent),
                (ast::Expr::CallExpr(_), _)
-                | (ast::Expr::IndexExpr(_), _)
-                | (ast::Expr::MethodCallExpr(_), _)
-                | (ast::Expr::FieldExpr(_), _)
-                | (ast::Expr::TryExpr(_), _)
-                | (ast::Expr::RefExpr(_), _)
-                | (ast::Expr::Literal(_), _)
-                | (ast::Expr::TupleExpr(_), _)
-                | (ast::Expr::ArrayExpr(_), _)
-                | (ast::Expr::ParenExpr(_), _)
-                | (ast::Expr::PathExpr(_), _)
-                | (ast::Expr::BlockExpr(_), _)
-                | (ast::Expr::EffectExpr(_), _)
-                | (_, ast::Expr::CallExpr(_))
-                | (_, ast::Expr::TupleExpr(_))
-                | (_, ast::Expr::ArrayExpr(_))
-                | (_, ast::Expr::ParenExpr(_))
-                | (_, ast::Expr::ForExpr(_))
-                | (_, ast::Expr::WhileExpr(_))
-                | (_, ast::Expr::BreakExpr(_))
-                | (_, ast::Expr::ReturnExpr(_))
-                | (_, ast::Expr::MatchExpr(_))
+                    | (ast::Expr::IndexExpr(_), _)
+                    | (ast::Expr::MethodCallExpr(_), _)
+                    | (ast::Expr::FieldExpr(_), _)
+                    | (ast::Expr::TryExpr(_), _)
+                    | (ast::Expr::RefExpr(_), _)
+                    | (ast::Expr::Literal(_), _)
+                    | (ast::Expr::TupleExpr(_), _)
+                    | (ast::Expr::ArrayExpr(_), _)
+                    | (ast::Expr::ParenExpr(_), _)
+                    | (ast::Expr::PathExpr(_), _)
+                    | (ast::Expr::BlockExpr(_), _)
+                    | (ast::Expr::EffectExpr(_), _)
+                    | (_, ast::Expr::CallExpr(_))
+                    | (_, ast::Expr::TupleExpr(_))
+                    | (_, ast::Expr::ArrayExpr(_))
+                    | (_, ast::Expr::ParenExpr(_))
+                    | (_, ast::Expr::ForExpr(_))
+                    | (_, ast::Expr::WhileExpr(_))
+                    | (_, ast::Expr::BreakExpr(_))
+                    | (_, ast::Expr::ReturnExpr(_))
+                    | (_, ast::Expr::MatchExpr(_))
            ))
        })
        .collect::<Result<Vec<_>, _>>()?;
--- a/crates/hir_def/src/body/lower.rs
+++ b/crates/hir_def/src/body/lower.rs
@ -386,6 +386,10 @@ impl ExprCollector<'_> {
                let expr = e.expr().map(|e| self.collect_expr(e));
                self.alloc_expr(Expr::Return { expr }, syntax_ptr)
            }
+            ast::Expr::YieldExpr(e) => {
+                let expr = e.expr().map(|e| self.collect_expr(e));
+                self.alloc_expr(Expr::Yield { expr }, syntax_ptr)
+            }
            ast::Expr::RecordExpr(e) => {
                let path = e.path().and_then(|path| self.expander.parse_path(path));
                let mut field_ptrs = Vec::new();
--- a/crates/hir_def/src/expr.rs
+++ b/crates/hir_def/src/expr.rs
@ -99,6 +99,9 @@ pub enum Expr {
    Return {
        expr: Option<ExprId>,
    },
+    Yield {
+        expr: Option<ExprId>,
+    },
    RecordLit {
        path: Option<Path>,
        fields: Vec<RecordLitField>,
@ -294,7 +297,7 @@ impl Expr {
                }
            }
            Expr::Continue { .. } => {}
-            Expr::Break { expr, .. } | Expr::Return { expr } => {
+            Expr::Break { expr, .. } | Expr::Return { expr } | Expr::Yield { expr } => {
                if let Some(expr) = expr {
                    f(*expr);
                }
--- a/crates/hir_ty/src/infer/expr.rs
+++ b/crates/hir_ty/src/infer/expr.rs
@ -367,6 +367,13 @@ impl<'a> InferenceContext<'a> {
                }
                Ty::simple(TypeCtor::Never)
            }
+            Expr::Yield { expr } => {
+                // FIXME: track yield type for coercion
+                if let Some(expr) = expr {
+                    self.infer_expr(*expr, &Expectation::none());
+                }
+                Ty::simple(TypeCtor::Never)
+            }
            Expr::RecordLit { path, fields, spread } => {
                let (ty, def_id) = self.resolve_variant(path.as_ref());
                if let Some(variant) = def_id {
--- a/crates/parser/src/grammar/expressions/atom.rs
+++ b/crates/parser/src/grammar/expressions/atom.rs
@ -50,6 +50,7 @@ pub(super) const ATOM_EXPR_FIRST: TokenSet =
        T![match],
        T![unsafe],
        T![return],
+        T![yield],
        T![break],
        T![continue],
        T![async],
@ -142,6 +143,7 @@ pub(super) fn atom_expr(p: &mut Parser, r: Restrictions) -> Option<(CompletedMar
            block_expr_unchecked(p)
        }
        T![return] => return_expr(p),
+        T![yield] => yield_expr(p),
        T![continue] => continue_expr(p),
        T![break] => break_expr(p, r),
        _ => {
@ -508,6 +510,20 @@ fn return_expr(p: &mut Parser) -> CompletedMarker {
    }
    m.complete(p, RETURN_EXPR)
 }
+// test yield_expr
+// fn foo() {
+//     yield;
+//     yield 1;
+// }
+fn yield_expr(p: &mut Parser) -> CompletedMarker {
+    assert!(p.at(T![yield]));
+    let m = p.start();
+    p.bump(T![yield]);
+    if p.at_ts(EXPR_FIRST) {
+        expr(p);
+    }
+    m.complete(p, YIELD_EXPR)
+}

 // test continue_expr
 // fn foo() {
--- a/crates/parser/src/syntax_kind/generated.rs
+++ b/crates/parser/src/syntax_kind/generated.rs
@ -101,6 +101,7 @@ pub enum SyntaxKind {
    USE_KW,
    WHERE_KW,
    WHILE_KW,
+    YIELD_KW,
    AUTO_KW,
    DEFAULT_KW,
    EXISTENTIAL_KW,
@ -186,6 +187,7 @@ pub enum SyntaxKind {
    LABEL,
    BLOCK_EXPR,
    RETURN_EXPR,
+    YIELD_EXPR,
    MATCH_EXPR,
    MATCH_ARM_LIST,
    MATCH_ARM,
@ -263,7 +265,8 @@ impl SyntaxKind {
            | IMPL_KW | IN_KW | LET_KW | LOOP_KW | MACRO_KW | MATCH_KW | MOD_KW | MOVE_KW
            | MUT_KW | PUB_KW | REF_KW | RETURN_KW | SELF_KW | STATIC_KW | STRUCT_KW | SUPER_KW
            | TRAIT_KW | TRUE_KW | TRY_KW | TYPE_KW | UNSAFE_KW | USE_KW | WHERE_KW | WHILE_KW
-            | AUTO_KW | DEFAULT_KW | EXISTENTIAL_KW | UNION_KW | RAW_KW | MACRO_RULES_KW => true,
+            | YIELD_KW | AUTO_KW | DEFAULT_KW | EXISTENTIAL_KW | UNION_KW | RAW_KW
+            | MACRO_RULES_KW => true,
            _ => false,
        }
    }
@ -326,6 +329,7 @@ impl SyntaxKind {
            "use" => USE_KW,
            "where" => WHERE_KW,
            "while" => WHILE_KW,
+            "yield" => YIELD_KW,
            _ => return None,
        };
        Some(kw)
@ -366,4 +370,4 @@ impl SyntaxKind {
    }
 }
 #[macro_export]
-macro_rules ! T { [;] => { $ crate :: SyntaxKind :: SEMICOLON } ; [,] => { $ crate :: SyntaxKind :: COMMA } ; ['('] => { $ crate :: SyntaxKind :: L_PAREN } ; [')'] => { $ crate :: SyntaxKind :: R_PAREN } ; ['{'] => { $ crate :: SyntaxKind :: L_CURLY } ; ['}'] => { $ crate :: SyntaxKind :: R_CURLY } ; ['['] => { $ crate :: SyntaxKind :: L_BRACK } ; [']'] => { $ crate :: SyntaxKind :: R_BRACK } ; [<] => { $ crate :: SyntaxKind :: L_ANGLE } ; [>] => { $ crate :: SyntaxKind :: R_ANGLE } ; [@] => { $ crate :: SyntaxKind :: AT } ; [#] => { $ crate :: SyntaxKind :: POUND } ; [~] => { $ crate :: SyntaxKind :: TILDE } ; [?] => { $ crate :: SyntaxKind :: QUESTION } ; [$] => { $ crate :: SyntaxKind :: DOLLAR } ; [&] => { $ crate :: SyntaxKind :: AMP } ; [|] => { $ crate :: SyntaxKind :: PIPE } ; [+] => { $ crate :: SyntaxKind :: PLUS } ; [*] => { $ crate :: SyntaxKind :: STAR } ; [/] => { $ crate :: SyntaxKind :: SLASH } ; [^] => { $ crate :: SyntaxKind :: CARET } ; [%] => { $ crate :: SyntaxKind :: PERCENT } ; [_] => { $ crate :: SyntaxKind :: UNDERSCORE } ; [.] => { $ crate :: SyntaxKind :: DOT } ; [..] => { $ crate :: SyntaxKind :: DOT2 } ; [...] => { $ crate :: SyntaxKind :: DOT3 } ; [..=] => { $ crate :: SyntaxKind :: DOT2EQ } ; [:] => { $ crate :: SyntaxKind :: COLON } ; [::] => { $ crate :: SyntaxKind :: COLON2 } ; [=] => { $ crate :: SyntaxKind :: EQ } ; [==] => { $ crate :: SyntaxKind :: EQ2 } ; [=>] => { $ crate :: SyntaxKind :: FAT_ARROW } ; [!] => { $ crate :: SyntaxKind :: BANG } ; [!=] => { $ crate :: SyntaxKind :: NEQ } ; [-] => { $ crate :: SyntaxKind :: MINUS } ; [->] => { $ crate :: SyntaxKind :: THIN_ARROW } ; [<=] => { $ crate :: SyntaxKind :: LTEQ } ; [>=] => { $ crate :: SyntaxKind :: GTEQ } ; [+=] => { $ crate :: SyntaxKind :: PLUSEQ } ; [-=] => { $ crate :: SyntaxKind :: MINUSEQ } ; [|=] => { $ crate :: SyntaxKind :: PIPEEQ } ; [&=] => { $ crate :: SyntaxKind :: AMPEQ } ; [^=] => { $ crate :: SyntaxKind :: CARETEQ } ; [/=] => { $ crate :: SyntaxKind :: SLASHEQ } ; [*=] => { $ crate :: SyntaxKind :: STAREQ } ; [%=] => { $ crate :: SyntaxKind :: PERCENTEQ } ; [&&] => { $ crate :: SyntaxKind :: AMP2 } ; [||] => { $ crate :: SyntaxKind :: PIPE2 } ; [<<] => { $ crate :: SyntaxKind :: SHL } ; [>>] => { $ crate :: SyntaxKind :: SHR } ; [<<=] => { $ crate :: SyntaxKind :: SHLEQ } ; [>>=] => { $ crate :: SyntaxKind :: SHREQ } ; [as] => { $ crate :: SyntaxKind :: AS_KW } ; [async] => { $ crate :: SyntaxKind :: ASYNC_KW } ; [await] => { $ crate :: SyntaxKind :: AWAIT_KW } ; [box] => { $ crate :: SyntaxKind :: BOX_KW } ; [break] => { $ crate :: SyntaxKind :: BREAK_KW } ; [const] => { $ crate :: SyntaxKind :: CONST_KW } ; [continue] => { $ crate :: SyntaxKind :: CONTINUE_KW } ; [crate] => { $ crate :: SyntaxKind :: CRATE_KW } ; [dyn] => { $ crate :: SyntaxKind :: DYN_KW } ; [else] => { $ crate :: SyntaxKind :: ELSE_KW } ; [enum] => { $ crate :: SyntaxKind :: ENUM_KW } ; [extern] => { $ crate :: SyntaxKind :: EXTERN_KW } ; [false] => { $ crate :: SyntaxKind :: FALSE_KW } ; [fn] => { $ crate :: SyntaxKind :: FN_KW } ; [for] => { $ crate :: SyntaxKind :: FOR_KW } ; [if] => { $ crate :: SyntaxKind :: IF_KW } ; [impl] => { $ crate :: SyntaxKind :: IMPL_KW } ; [in] => { $ crate :: SyntaxKind :: IN_KW } ; [let] => { $ crate :: SyntaxKind :: LET_KW } ; [loop] => { $ crate :: SyntaxKind :: LOOP_KW } ; [macro] => { $ crate :: SyntaxKind :: MACRO_KW } ; [match] => { $ crate :: SyntaxKind :: MATCH_KW } ; [mod] => { $ crate :: SyntaxKind :: MOD_KW } ; [move] => { $ crate :: SyntaxKind :: MOVE_KW } ; [mut] => { $ crate :: SyntaxKind :: MUT_KW } ; [pub] => { $ crate :: SyntaxKind :: PUB_KW } ; [ref] => { $ crate :: SyntaxKind :: REF_KW } ; [return] => { $ crate :: SyntaxKind :: RETURN_KW } ; [self] => { $ crate :: SyntaxKind :: SELF_KW } ; [static] => { $ crate :: SyntaxKind :: STATIC_KW } ; [struct] => { $ crate :: SyntaxKind :: STRUCT_KW } ; [super] => { $ crate :: SyntaxKind :: SUPER_KW } ; [trait] => { $ crate :: SyntaxKind :: TRAIT_KW } ; [true] => { $ crate :: SyntaxKind :: TRUE_KW } ; [try] => { $ crate :: SyntaxKind :: TRY_KW } ; [type] => { $ crate :: SyntaxKind :: TYPE_KW } ; [unsafe] => { $ crate :: SyntaxKind :: UNSAFE_KW } ; [use] => { $ crate :: SyntaxKind :: USE_KW } ; [where] => { $ crate :: SyntaxKind :: WHERE_KW } ; [while] => { $ crate :: SyntaxKind :: WHILE_KW } ; [auto] => { $ crate :: SyntaxKind :: AUTO_KW } ; [default] => { $ crate :: SyntaxKind :: DEFAULT_KW } ; [existential] => { $ crate :: SyntaxKind :: EXISTENTIAL_KW } ; [union] => { $ crate :: SyntaxKind :: UNION_KW } ; [raw] => { $ crate :: SyntaxKind :: RAW_KW } ; [macro_rules] => { $ crate :: SyntaxKind :: MACRO_RULES_KW } ; [lifetime_ident] => { $ crate :: SyntaxKind :: LIFETIME_IDENT } ; [ident] => { $ crate :: SyntaxKind :: IDENT } ; [shebang] => { $ crate :: SyntaxKind :: SHEBANG } ; }
+macro_rules ! T { [;] => { $ crate :: SyntaxKind :: SEMICOLON } ; [,] => { $ crate :: SyntaxKind :: COMMA } ; ['('] => { $ crate :: SyntaxKind :: L_PAREN } ; [')'] => { $ crate :: SyntaxKind :: R_PAREN } ; ['{'] => { $ crate :: SyntaxKind :: L_CURLY } ; ['}'] => { $ crate :: SyntaxKind :: R_CURLY } ; ['['] => { $ crate :: SyntaxKind :: L_BRACK } ; [']'] => { $ crate :: SyntaxKind :: R_BRACK } ; [<] => { $ crate :: SyntaxKind :: L_ANGLE } ; [>] => { $ crate :: SyntaxKind :: R_ANGLE } ; [@] => { $ crate :: SyntaxKind :: AT } ; [#] => { $ crate :: SyntaxKind :: POUND } ; [~] => { $ crate :: SyntaxKind :: TILDE } ; [?] => { $ crate :: SyntaxKind :: QUESTION } ; [$] => { $ crate :: SyntaxKind :: DOLLAR } ; [&] => { $ crate :: SyntaxKind :: AMP } ; [|] => { $ crate :: SyntaxKind :: PIPE } ; [+] => { $ crate :: SyntaxKind :: PLUS } ; [*] => { $ crate :: SyntaxKind :: STAR } ; [/] => { $ crate :: SyntaxKind :: SLASH } ; [^] => { $ crate :: SyntaxKind :: CARET } ; [%] => { $ crate :: SyntaxKind :: PERCENT } ; [_] => { $ crate :: SyntaxKind :: UNDERSCORE } ; [.] => { $ crate :: SyntaxKind :: DOT } ; [..] => { $ crate :: SyntaxKind :: DOT2 } ; [...] => { $ crate :: SyntaxKind :: DOT3 } ; [..=] => { $ crate :: SyntaxKind :: DOT2EQ } ; [:] => { $ crate :: SyntaxKind :: COLON } ; [::] => { $ crate :: SyntaxKind :: COLON2 } ; [=] => { $ crate :: SyntaxKind :: EQ } ; [==] => { $ crate :: SyntaxKind :: EQ2 } ; [=>] => { $ crate :: SyntaxKind :: FAT_ARROW } ; [!] => { $ crate :: SyntaxKind :: BANG } ; [!=] => { $ crate :: SyntaxKind :: NEQ } ; [-] => { $ crate :: SyntaxKind :: MINUS } ; [->] => { $ crate :: SyntaxKind :: THIN_ARROW } ; [<=] => { $ crate :: SyntaxKind :: LTEQ } ; [>=] => { $ crate :: SyntaxKind :: GTEQ } ; [+=] => { $ crate :: SyntaxKind :: PLUSEQ } ; [-=] => { $ crate :: SyntaxKind :: MINUSEQ } ; [|=] => { $ crate :: SyntaxKind :: PIPEEQ } ; [&=] => { $ crate :: SyntaxKind :: AMPEQ } ; [^=] => { $ crate :: SyntaxKind :: CARETEQ } ; [/=] => { $ crate :: SyntaxKind :: SLASHEQ } ; [*=] => { $ crate :: SyntaxKind :: STAREQ } ; [%=] => { $ crate :: SyntaxKind :: PERCENTEQ } ; [&&] => { $ crate :: SyntaxKind :: AMP2 } ; [||] => { $ crate :: SyntaxKind :: PIPE2 } ; [<<] => { $ crate :: SyntaxKind :: SHL } ; [>>] => { $ crate :: SyntaxKind :: SHR } ; [<<=] => { $ crate :: SyntaxKind :: SHLEQ } ; [>>=] => { $ crate :: SyntaxKind :: SHREQ } ; [as] => { $ crate :: SyntaxKind :: AS_KW } ; [async] => { $ crate :: SyntaxKind :: ASYNC_KW } ; [await] => { $ crate :: SyntaxKind :: AWAIT_KW } ; [box] => { $ crate :: SyntaxKind :: BOX_KW } ; [break] => { $ crate :: SyntaxKind :: BREAK_KW } ; [const] => { $ crate :: SyntaxKind :: CONST_KW } ; [continue] => { $ crate :: SyntaxKind :: CONTINUE_KW } ; [crate] => { $ crate :: SyntaxKind :: CRATE_KW } ; [dyn] => { $ crate :: SyntaxKind :: DYN_KW } ; [else] => { $ crate :: SyntaxKind :: ELSE_KW } ; [enum] => { $ crate :: SyntaxKind :: ENUM_KW } ; [extern] => { $ crate :: SyntaxKind :: EXTERN_KW } ; [false] => { $ crate :: SyntaxKind :: FALSE_KW } ; [fn] => { $ crate :: SyntaxKind :: FN_KW } ; [for] => { $ crate :: SyntaxKind :: FOR_KW } ; [if] => { $ crate :: SyntaxKind :: IF_KW } ; [impl] => { $ crate :: SyntaxKind :: IMPL_KW } ; [in] => { $ crate :: SyntaxKind :: IN_KW } ; [let] => { $ crate :: SyntaxKind :: LET_KW } ; [loop] => { $ crate :: SyntaxKind :: LOOP_KW } ; [macro] => { $ crate :: SyntaxKind :: MACRO_KW } ; [match] => { $ crate :: SyntaxKind :: MATCH_KW } ; [mod] => { $ crate :: SyntaxKind :: MOD_KW } ; [move] => { $ crate :: SyntaxKind :: MOVE_KW } ; [mut] => { $ crate :: SyntaxKind :: MUT_KW } ; [pub] => { $ crate :: SyntaxKind :: PUB_KW } ; [ref] => { $ crate :: SyntaxKind :: REF_KW } ; [return] => { $ crate :: SyntaxKind :: RETURN_KW } ; [self] => { $ crate :: SyntaxKind :: SELF_KW } ; [static] => { $ crate :: SyntaxKind :: STATIC_KW } ; [struct] => { $ crate :: SyntaxKind :: STRUCT_KW } ; [super] => { $ crate :: SyntaxKind :: SUPER_KW } ; [trait] => { $ crate :: SyntaxKind :: TRAIT_KW } ; [true] => { $ crate :: SyntaxKind :: TRUE_KW } ; [try] => { $ crate :: SyntaxKind :: TRY_KW } ; [type] => { $ crate :: SyntaxKind :: TYPE_KW } ; [unsafe] => { $ crate :: SyntaxKind :: UNSAFE_KW } ; [use] => { $ crate :: SyntaxKind :: USE_KW } ; [where] => { $ crate :: SyntaxKind :: WHERE_KW } ; [while] => { $ crate :: SyntaxKind :: WHILE_KW } ; [yield] => { $ crate :: SyntaxKind :: YIELD_KW } ; [auto] => { $ crate :: SyntaxKind :: AUTO_KW } ; [default] => { $ crate :: SyntaxKind :: DEFAULT_KW } ; [existential] => { $ crate :: SyntaxKind :: EXISTENTIAL_KW } ; [union] => { $ crate :: SyntaxKind :: UNION_KW } ; [raw] => { $ crate :: SyntaxKind :: RAW_KW } ; [macro_rules] => { $ crate :: SyntaxKind :: MACRO_RULES_KW } ; [lifetime_ident] => { $ crate :: SyntaxKind :: LIFETIME_IDENT } ; [ident] => { $ crate :: SyntaxKind :: IDENT } ; [shebang] => { $ crate :: SyntaxKind :: SHEBANG } ; }
--- a/crates/syntax/src/ast/generated/nodes.rs
+++ b/crates/syntax/src/ast/generated/nodes.rs
@ -931,6 +931,15 @@ impl WhileExpr {
    pub fn condition(&self) -> Option<Condition> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct YieldExpr {
+    pub(crate) syntax: SyntaxNode,
+}
+impl ast::AttrsOwner for YieldExpr {}
+impl YieldExpr {
+    pub fn yield_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![yield]) }
+    pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct Label {
    pub(crate) syntax: SyntaxNode,
 }
@ -1334,6 +1343,7 @@ pub enum Expr {
    TryExpr(TryExpr),
    TupleExpr(TupleExpr),
    WhileExpr(WhileExpr),
+    YieldExpr(YieldExpr),
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum Item {
@ -2386,6 +2396,17 @@ impl AstNode for WhileExpr {
    }
    fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
+impl AstNode for YieldExpr {
+    fn can_cast(kind: SyntaxKind) -> bool { kind == YIELD_EXPR }
+    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 Label {
    fn can_cast(kind: SyntaxKind) -> bool { kind == LABEL }
    fn cast(syntax: SyntaxNode) -> Option<Self> {
@ -3028,6 +3049,9 @@ impl From<TupleExpr> for Expr {
 impl From<WhileExpr> for Expr {
    fn from(node: WhileExpr) -> Expr { Expr::WhileExpr(node) }
 }
+impl From<YieldExpr> for Expr {
+    fn from(node: YieldExpr) -> Expr { Expr::YieldExpr(node) }
+}
 impl AstNode for Expr {
    fn can_cast(kind: SyntaxKind) -> bool {
        match kind {
@ -3035,7 +3059,8 @@ impl AstNode for Expr {
            | CAST_EXPR | CLOSURE_EXPR | CONTINUE_EXPR | EFFECT_EXPR | FIELD_EXPR | FOR_EXPR
            | IF_EXPR | INDEX_EXPR | LITERAL | LOOP_EXPR | MACRO_CALL | MATCH_EXPR
            | METHOD_CALL_EXPR | PAREN_EXPR | PATH_EXPR | PREFIX_EXPR | RANGE_EXPR
-            | RECORD_EXPR | REF_EXPR | RETURN_EXPR | TRY_EXPR | TUPLE_EXPR | WHILE_EXPR => true,
+            | RECORD_EXPR | REF_EXPR | RETURN_EXPR | TRY_EXPR | TUPLE_EXPR | WHILE_EXPR
+            | YIELD_EXPR => true,
            _ => false,
        }
    }
@ -3071,6 +3096,7 @@ impl AstNode for Expr {
            TRY_EXPR => Expr::TryExpr(TryExpr { syntax }),
            TUPLE_EXPR => Expr::TupleExpr(TupleExpr { syntax }),
            WHILE_EXPR => Expr::WhileExpr(WhileExpr { syntax }),
+            YIELD_EXPR => Expr::YieldExpr(YieldExpr { syntax }),
            _ => return None,
        };
        Some(res)
@ -3107,6 +3133,7 @@ impl AstNode for Expr {
            Expr::TryExpr(it) => &it.syntax,
            Expr::TupleExpr(it) => &it.syntax,
            Expr::WhileExpr(it) => &it.syntax,
+            Expr::YieldExpr(it) => &it.syntax,
        }
    }
 }
@ -3983,6 +4010,11 @@ impl std::fmt::Display for WhileExpr {
        std::fmt::Display::fmt(self.syntax(), f)
    }
 }
+impl std::fmt::Display for YieldExpr {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Display::fmt(self.syntax(), f)
+    }
+}
 impl std::fmt::Display for Label {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        std::fmt::Display::fmt(self.syntax(), f)
--- a/xtask/src/ast_src.rs
+++ b/xtask/src/ast_src.rs
@ -68,7 +68,7 @@ pub(crate) const KINDS_SRC: KindsSrc = KindsSrc {
        "as", "async", "await", "box", "break", "const", "continue", "crate", "dyn", "else",
        "enum", "extern", "false", "fn", "for", "if", "impl", "in", "let", "loop", "macro",
        "match", "mod", "move", "mut", "pub", "ref", "return", "self", "static", "struct", "super",
-        "trait", "true", "try", "type", "unsafe", "use", "where", "while",
+        "trait", "true", "try", "type", "unsafe", "use", "where", "while", "yield",
    ],
    contextual_keywords: &["auto", "default", "existential", "union", "raw", "macro_rules"],
    literals: &["INT_NUMBER", "FLOAT_NUMBER", "CHAR", "BYTE", "STRING", "BYTE_STRING"],
@ -149,6 +149,7 @@ pub(crate) const KINDS_SRC: KindsSrc = KindsSrc {
        "LABEL",
        "BLOCK_EXPR",
        "RETURN_EXPR",
+        "YIELD_EXPR",
        "MATCH_EXPR",
        "MATCH_ARM_LIST",
        "MATCH_ARM",