feat: Implement yeeting

crates/hir-def/src/body/lower.rs

@@ -371,6 +371,10 @@ impl ExprCollector<'_> {
                 let expr = e.expr().map(|e| self.collect_expr(e));
                 self.alloc_expr(Expr::Yield { expr }, syntax_ptr)
             }
+            ast::Expr::YeetExpr(e) => {
+                let expr = e.expr().map(|e| self.collect_expr(e));
+                self.alloc_expr(Expr::Yeet { expr }, syntax_ptr)
+            }
             ast::Expr::RecordExpr(e) => {
                 let path =
                     e.path().and_then(|path| self.expander.parse_path(self.db, path)).map(Box::new);

crates/hir-def/src/body/pretty.rs

@@ -247,6 +247,15 @@ impl<'a> Printer<'a> {
                     self.print_expr(*expr);
                 }
             }
+            Expr::Yeet { expr } => {
+                w!(self, "do");
+                self.whitespace();
+                w!(self, "yeet");
+                if let Some(expr) = expr {
+                    self.whitespace();
+                    self.print_expr(*expr);
+                }
+            }
             Expr::RecordLit { path, fields, spread, ellipsis, is_assignee_expr: _ } => {
                 match path {
                     Some(path) => self.print_path(path),

crates/hir-def/src/expr.rs

@@ -137,6 +137,9 @@ pub enum Expr {
     Yield {
         expr: Option<ExprId>,
     },
+    Yeet {
+        expr: Option<ExprId>,
+    },
     RecordLit {
         path: Option<Box<Path>>,
         fields: Box<[RecordLitField]>,
@@ -313,7 +316,10 @@ impl Expr {
                 arms.iter().map(|arm| arm.expr).for_each(f);
             }
             Expr::Continue { .. } => {}
-            Expr::Break { expr, .. } | Expr::Return { expr } | Expr::Yield { expr } => {
+            Expr::Break { expr, .. }
+            | Expr::Return { expr }
+            | Expr::Yield { expr }
+            | Expr::Yeet { expr } => {
                 if let &Some(expr) = expr {
                     f(expr);
                 }

crates/hir-ty/src/infer/expr.rs

@@ -465,6 +465,12 @@ impl<'a> InferenceContext<'a> {
                     TyKind::Error.intern(Interner)
                 }
             }
+            Expr::Yeet { expr } => {
+                if let &Some(expr) = expr {
+                    self.infer_expr_inner(expr, &Expectation::None);
+                }
+                TyKind::Never.intern(Interner)
+            }
             Expr::RecordLit { path, fields, spread, .. } => {
                 let (ty, def_id) = self.resolve_variant(path.as_deref(), false);
                 if let Some(variant) = def_id {

crates/ide-db/src/syntax_helpers/node_ext.rs

@@ -328,7 +328,8 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
         | ast::Expr::WhileExpr(_)
         | ast::Expr::LetExpr(_)
         | ast::Expr::UnderscoreExpr(_)
-        | ast::Expr::YieldExpr(_) => cb(expr),
+        | ast::Expr::YieldExpr(_)
+        | ast::Expr::YeetExpr(_) => cb(expr),
     }
 }
 

crates/ide/src/signature_help.rs

@@ -646,7 +646,7 @@ pub fn add_one(x: i32) -> i32 {
     x + 1
 }
 
-pub fn do() {
+pub fn r#do() {
     add_one($0
 }"#,
             expect![[r##"

crates/ide/src/syntax_highlighting/highlight.rs

@@ -174,6 +174,7 @@ fn keyword(
         | T![return]
         | T![while]
         | T![yield] => h | HlMod::ControlFlow,
+        T![do] | T![yeet] if parent_matches::<ast::YeetExpr>(&token) => h | HlMod::ControlFlow,
         T![for] if parent_matches::<ast::ForExpr>(&token) => h | HlMod::ControlFlow,
         T![unsafe] => h | HlMod::Unsafe,
         T![true] | T![false] => HlTag::BoolLiteral.into(),

crates/parser/src/grammar/expressions/atom.rs

@@ -48,6 +48,7 @@ pub(super) const ATOM_EXPR_FIRST: TokenSet =
         T![unsafe],
         T![return],
         T![yield],
+        T![do],
         T![break],
         T![continue],
         T![async],
@@ -93,6 +94,7 @@ pub(super) fn atom_expr(
         T![match] => match_expr(p),
         T![return] => return_expr(p),
         T![yield] => yield_expr(p),
+        T![do] if p.nth_at_contextual_kw(1, T![yeet]) => yeet_expr(p),
         T![continue] => continue_expr(p),
         T![break] => break_expr(p, r),
 
@@ -533,6 +535,7 @@ fn return_expr(p: &mut Parser<'_>) -> CompletedMarker {
     }
     m.complete(p, RETURN_EXPR)
 }
+
 // test yield_expr
 // fn foo() {
 //     yield;
@@ -548,6 +551,23 @@ fn yield_expr(p: &mut Parser<'_>) -> CompletedMarker {
     m.complete(p, YIELD_EXPR)
 }
 
+// test yeet_expr
+// fn foo() {
+//     do yeet;
+//     do yeet 1
+// }
+fn yeet_expr(p: &mut Parser<'_>) -> CompletedMarker {
+    assert!(p.at(T![do]));
+    assert!(p.nth_at_contextual_kw(1, T![yeet]));
+    let m = p.start();
+    p.bump(T![do]);
+    p.bump_remap(T![yeet]);
+    if p.at_ts(EXPR_FIRST) {
+        expr(p);
+    }
+    m.complete(p, YEET_EXPR)
+}
+
 // test continue_expr
 // fn foo() {
 //     loop {

crates/parser/src/parser.rs

@@ -148,11 +148,16 @@ impl<'t> Parser<'t> {
         kinds.contains(self.current())
     }
 
-    /// Checks if the current token is contextual keyword with text `t`.
+    /// Checks if the current token is contextual keyword `kw`.
     pub(crate) fn at_contextual_kw(&self, kw: SyntaxKind) -> bool {
         self.inp.contextual_kind(self.pos) == kw
     }
 
+    /// Checks if the nth token is contextual keyword `kw`.
+    pub(crate) fn nth_at_contextual_kw(&self, n: usize, kw: SyntaxKind) -> bool {
+        self.inp.contextual_kind(self.pos + n) == kw
+    }
+
     /// Starts a new node in the syntax tree. All nodes and tokens
     /// consumed between the `start` and the corresponding `Marker::complete`
     /// belong to the same node.

crates/parser/src/syntax_kind/generated.rs

@@ -69,6 +69,7 @@ pub enum SyntaxKind {
     CONST_KW,
     CONTINUE_KW,
     CRATE_KW,
+    DO_KW,
     DYN_KW,
     ELSE_KW,
     ENUM_KW,
@@ -109,6 +110,7 @@ pub enum SyntaxKind {
     UNION_KW,
     RAW_KW,
     MACRO_RULES_KW,
+    YEET_KW,
     INT_NUMBER,
     FLOAT_NUMBER,
     CHAR,
@@ -188,6 +190,7 @@ pub enum SyntaxKind {
     STMT_LIST,
     RETURN_EXPR,
     YIELD_EXPR,
+    YEET_EXPR,
     LET_EXPR,
     UNDERSCORE_EXPR,
     MACRO_EXPR,
@@ -272,6 +275,7 @@ impl SyntaxKind {
                 | CONST_KW
                 | CONTINUE_KW
                 | CRATE_KW
+                | DO_KW
                 | DYN_KW
                 | ELSE_KW
                 | ENUM_KW
@@ -312,6 +316,7 @@ impl SyntaxKind {
                 | UNION_KW
                 | RAW_KW
                 | MACRO_RULES_KW
+                | YEET_KW
         )
     }
     pub fn is_punct(self) -> bool {
@@ -384,6 +389,7 @@ impl SyntaxKind {
             "const" => CONST_KW,
             "continue" => CONTINUE_KW,
             "crate" => CRATE_KW,
+            "do" => DO_KW,
             "dyn" => DYN_KW,
             "else" => ELSE_KW,
             "enum" => ENUM_KW,
@@ -430,6 +436,7 @@ impl SyntaxKind {
             "union" => UNION_KW,
             "raw" => RAW_KW,
             "macro_rules" => MACRO_RULES_KW,
+            "yeet" => YEET_KW,
             _ => return None,
         };
         Some(kw)
@@ -470,5 +477,5 @@ 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 } ; [Self] => { $ crate :: SyntaxKind :: SELF_TYPE_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 } ; }
+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 } ; [do] => { $ crate :: SyntaxKind :: DO_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 } ; [Self] => { $ crate :: SyntaxKind :: SELF_TYPE_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 } ; [yeet] => { $ crate :: SyntaxKind :: YEET_KW } ; [lifetime_ident] => { $ crate :: SyntaxKind :: LIFETIME_IDENT } ; [ident] => { $ crate :: SyntaxKind :: IDENT } ; [shebang] => { $ crate :: SyntaxKind :: SHEBANG } ; }
 pub use T;

crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rast

@@ -0,0 +1,31 @@
+SOURCE_FILE
+  FN
+    FN_KW "fn"
+    WHITESPACE " "
+    NAME
+      IDENT "foo"
+    PARAM_LIST
+      L_PAREN "("
+      R_PAREN ")"
+    WHITESPACE " "
+    BLOCK_EXPR
+      STMT_LIST
+        L_CURLY "{"
+        WHITESPACE "\n    "
+        EXPR_STMT
+          YEET_EXPR
+            DO_KW "do"
+            WHITESPACE " "
+            YEET_KW "yeet"
+          SEMICOLON ";"
+        WHITESPACE "\n    "
+        YEET_EXPR
+          DO_KW "do"
+          WHITESPACE " "
+          YEET_KW "yeet"
+          WHITESPACE " "
+          LITERAL
+            INT_NUMBER "1"
+        WHITESPACE "\n"
+        R_CURLY "}"
+  WHITESPACE "\n"

crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rs

@@ -0,0 +1,4 @@
+fn foo() {
+    do yeet;
+    do yeet 1
+}

crates/syntax/rust.ungram

@@ -359,6 +359,7 @@ Expr =
 | TupleExpr
 | WhileExpr
 | YieldExpr
+| YeetExpr
 | LetExpr
 | UnderscoreExpr
 
@@ -503,6 +504,9 @@ ReturnExpr =
 YieldExpr =
   Attr* 'yield' Expr?
 
+YeetExpr =
+  Attr* 'do' 'yeet' Expr?
+
 LetExpr =
   Attr* 'let' Pat '=' Expr