Update parser

compiler/erg_common/traits.rs

@@ -212,7 +212,7 @@ macro_rules! impl_stream_for_wrapper {
             }
         }
 
-        impl erg_common::traits::Stream<$Inner> for $Strc {
+        impl $crate::traits::Stream<$Inner> for $Strc {
             #[inline]
             fn payload(self) -> Vec<$Inner> {
                 self.0
@@ -232,7 +232,7 @@ macro_rules! impl_stream_for_wrapper {
 #[macro_export]
 macro_rules! impl_stream {
     ($Strc: ident, $Inner: ident, $field: ident) => {
-        impl erg_common::traits::Stream<$Inner> for $Strc {
+        impl $crate::traits::Stream<$Inner> for $Strc {
             #[inline]
             fn payload(self) -> Vec<$Inner> {
                 self.$field

compiler/erg_compiler/codegen.rs

@@ -701,6 +701,9 @@ impl CodeGenerator {
         self.emit_store_instr(sig.ident, Name);
     }
 
+    // NOTE: use `TypeVar`, `Generic` in `typing` module
+    // fn emit_poly_type_def(&mut self, sig: SubrSignature, body: DefBody) {}
+
     fn emit_var_def(&mut self, sig: VarSignature, mut body: DefBody) {
         if body.is_type() {
             return self.emit_mono_type_def(sig, body);

compiler/erg_compiler/eval.rs

@@ -264,7 +264,7 @@ impl Evaluator {
         Some(ValueObj::Array(RcArray::from(elems)))
     }
 
-    fn eval_const_record(&self, record: &Record, ctx: &Context) -> Option<ValueObj> {
+    fn eval_const_record(&self, record: &NormalRecord, ctx: &Context) -> Option<ValueObj> {
         let mut attrs = vec![];
         for attr in record.attrs.iter() {
             if let Some(elem) = self.eval_const_block(&attr.body.block, ctx) {

compiler/erg_compiler/lower.rs

@@ -217,7 +217,7 @@ impl ASTLowerer {
         Ok(hir::NormalTuple::new(hir::Args::from(new_tuple)))
     }
 
-    fn lower_record(&mut self, record: ast::Record) -> LowerResult<hir::Record> {
+    fn lower_record(&mut self, record: ast::NormalRecord) -> LowerResult<hir::Record> {
         log!(info "entered {}({record})", fn_name!());
         let mut hir_record =
             hir::Record::new(record.l_brace, record.r_brace, hir::RecordAttrs::new());

compiler/erg_parser/ast.rs

@@ -179,6 +179,10 @@ impl Args {
         self.pos_args.is_empty() && self.kw_args.is_empty()
     }
 
+    pub fn len(&self) -> usize {
+        self.pos_args.len() + self.kw_args.len()
+    }
+
     pub fn kw_is_empty(&self) -> bool {
         self.kw_args.is_empty()
     }
@@ -306,12 +310,13 @@ impl Public {
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct Attribute {
     pub obj: Box<Expr>,
+    pub vis: Token,
     pub name: Local,
 }
 
 impl NestedDisplay for Attribute {
     fn fmt_nest(&self, f: &mut std::fmt::Formatter<'_>, _level: usize) -> std::fmt::Result {
-        write!(f, "({}).{}", self.obj, self.name)
+        write!(f, "({}){}{}", self.obj, self.vis.inspect(), self.name)
     }
 }
 
@@ -319,9 +324,10 @@ impl_display_from_nested!(Attribute);
 impl_locational!(Attribute, obj, name);
 
 impl Attribute {
-    pub fn new(obj: Expr, name: Local) -> Self {
+    pub fn new(obj: Expr, vis: Token, name: Local) -> Self {
         Self {
             obj: Box::new(obj),
+            vis,
             name,
         }
     }
@@ -398,8 +404,8 @@ impl Accessor {
         Self::Public(Public::new(dot, symbol))
     }
 
-    pub fn attr(obj: Expr, name: Local) -> Self {
-        Self::Attr(Attribute::new(obj, name))
+    pub fn attr(obj: Expr, vis: Token, name: Local) -> Self {
+        Self::Attr(Attribute::new(obj, vis, name))
     }
 
     pub fn tuple_attr(obj: Expr, index: Literal) -> Self {
@@ -679,13 +685,13 @@ impl RecordAttrs {
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
-pub struct Record {
+pub struct NormalRecord {
     pub l_brace: Token,
     pub r_brace: Token,
     pub attrs: RecordAttrs,
 }
 
-impl NestedDisplay for Record {
+impl NestedDisplay for NormalRecord {
     fn fmt_nest(&self, f: &mut fmt::Formatter<'_>, level: usize) -> fmt::Result {
         writeln!(f, "{{")?;
         self.attrs.fmt_nest(f, level + 1)?;
@@ -693,10 +699,10 @@ impl NestedDisplay for Record {
     }
 }
 
-impl_display_from_nested!(Record);
-impl_locational!(Record, l_brace, r_brace);
+impl_display_from_nested!(NormalRecord);
+impl_locational!(NormalRecord, l_brace, r_brace);
 
-impl Record {
+impl NormalRecord {
     pub fn new(l_brace: Token, r_brace: Token, attrs: RecordAttrs) -> Self {
         Self {
             l_brace,
@@ -706,6 +712,14 @@ impl Record {
     }
 }
 
+/// e.g. {x; y; z} (syntax sugar of {x = x; y = y; z = z})
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct SimpleRecord {
+    pub l_brace: Token,
+    pub r_brace: Token,
+    idents: Vec<Identifier>,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct NormalSet {
     l_brace: Token,
@@ -1649,6 +1663,14 @@ impl Decorator {
     pub const fn new(expr: Expr) -> Self {
         Self(expr)
     }
+
+    pub fn expr(&self) -> &Expr {
+        &self.0
+    }
+
+    pub fn into_expr(self) -> Expr {
+        self.0
+    }
 }
 
 /// symbol as a left value
@@ -2142,10 +2164,13 @@ pub enum ParamPattern {
     Array(ParamArrayPattern),
     Tuple(ParamTuplePattern),
     Record(ParamRecordPattern),
+    Ref(VarName),
+    RefMut(VarName),
+    VarArgs(VarName),
 }
 
-impl_display_for_enum!(ParamPattern; Discard, VarName, VarArgsName, Lit, Array, Tuple Record);
-impl_locational_for_enum!(ParamPattern; Discard, VarName, VarArgsName, Lit, Array, Tuple, Record);
+impl_display_for_enum!(ParamPattern; Discard, VarName, VarArgsName, Lit, Array, Tuple, Record, Ref, RefMut, VarArgs);
+impl_locational_for_enum!(ParamPattern; Discard, VarName, VarArgsName, Lit, Array, Tuple, Record, Ref, RefMut, VarArgs);
 
 impl ParamPattern {
     pub const fn inspect(&self) -> Option<&Str> {
@@ -2646,7 +2671,7 @@ pub enum Expr {
     Tuple(Tuple),
     Dict(Dict),
     Set(Set),
-    Record(Record),
+    Record(NormalRecord),
     BinOp(BinOp),
     UnaryOp(UnaryOp),
     Call(Call),

compiler/erg_parser/desugar.rs

@@ -244,7 +244,12 @@ impl Desugarer {
                 Accessor::subscr(obj, Expr::Lit(Literal::nat(n, sig.ln_begin().unwrap())))
             }
             BufIndex::Record(attr) => {
-                Accessor::attr(obj, Local::dummy_with_line(attr, sig.ln_begin().unwrap()))
+                // TODO: visibility
+                Accessor::attr(
+                    obj,
+                    Token::from_str(TokenKind::Dot, "."),
+                    Local::dummy_with_line(attr, sig.ln_begin().unwrap()),
+                )
             }
         };
         let id = DefId(get_hash(&(&acc, buf_name)));

compiler/erg_parser/parse.rs

@@ -64,7 +64,7 @@ pub enum ArrayInner {
 pub enum BraceContainer {
     Set(Set),
     Dict(Dict),
-    Record(Record),
+    Record(NormalRecord),
 }
 
 /// Perform recursive descent parsing.
@@ -372,6 +372,11 @@ impl Parser {
         let mut decs = set![];
         while let Some(deco) = self.opt_reduce_decorator().map_err(|_| self.stack_dec())? {
             decs.insert(deco);
+            if self.cur_is(Newline) {
+                self.skip();
+            } else {
+                todo!()
+            }
         }
         self.level -= 1;
         Ok(decs)
@@ -403,17 +408,44 @@ impl Parser {
         loop {
             match self.peek() {
                 Some(t) if t.is(Dot) => {
-                    self.skip();
+                    let vis = self.lpop();
                     let token = self.lpop();
                     match token.kind {
                         Symbol => {
                             let attr = Local::new(token);
-                            acc = Accessor::attr(Expr::Accessor(acc), attr);
+                            acc = Accessor::attr(Expr::Accessor(acc), vis, attr);
                         }
                         NatLit => {
                             let attr = Literal::from(token);
                             acc = Accessor::tuple_attr(Expr::Accessor(acc), attr);
                         }
+                        Newline => {
+                            self.restore(token);
+                            self.restore(vis);
+                            break;
+                        }
+                        _ => {
+                            self.restore(token);
+                            self.level -= 1;
+                            let err = self.skip_and_throw_syntax_err(caused_by!());
+                            self.errs.push(err);
+                            return Err(());
+                        }
+                    }
+                }
+                Some(t) if t.is(DblColon) => {
+                    let vis = self.lpop();
+                    let token = self.lpop();
+                    match token.kind {
+                        Symbol => {
+                            let attr = Local::new(token);
+                            acc = Accessor::attr(Expr::Accessor(acc), vis, attr);
+                        }
+                        Newline => {
+                            self.restore(token);
+                            self.restore(vis);
+                            break;
+                        }
                         _ => {
                             self.restore(token);
                             self.level -= 1;
@@ -479,39 +511,6 @@ impl Parser {
         }
     }
 
-    fn _validate_const_pos_arg(&mut self, arg: PosArg) -> ParseResult<ConstPosArg> {
-        let expr = self.validate_const_expr(arg.expr)?;
-        Ok(ConstPosArg::new(expr))
-    }
-
-    fn _validate_const_kw_arg(&mut self, arg: KwArg) -> ParseResult<ConstKwArg> {
-        let expr = self.validate_const_expr(arg.expr)?;
-        Ok(ConstKwArg::new(arg.keyword, expr))
-    }
-
-    // exprが定数式か確認する
-    fn _validate_const_args(&mut self, args: Args) -> ParseResult<ConstArgs> {
-        let (pos, kw, paren) = args.deconstruct();
-        let mut const_args = ConstArgs::new(vec![], vec![], paren);
-        for arg in pos.into_iter() {
-            match self._validate_const_pos_arg(arg) {
-                Ok(arg) => {
-                    const_args.push_pos(arg);
-                }
-                Err(e) => return Err(e),
-            }
-        }
-        for arg in kw.into_iter() {
-            match self._validate_const_kw_arg(arg) {
-                Ok(arg) => {
-                    const_args.push_kw(arg);
-                }
-                Err(e) => return Err(e),
-            }
-        }
-        Ok(const_args)
-    }
-
     /// For parsing elements of arrays and tuples
     fn try_reduce_elems(&mut self) -> ParseResult<ArrayInner> {
         debug_call_info!(self);
@@ -595,14 +594,15 @@ impl Parser {
                 if t.category_is(TC::Literal)
                     || t.is(Symbol)
                     || t.category_is(TC::UnaryOp)
-                    || t.is(Dot)
-                    || t.category_is(TC::Caret)
                     || t.is(LParen)
                     || t.is(LSqBr)
                     || t.is(LBrace) =>
             {
                 Some(self.try_reduce_args())
             }
+            Some(t) if (t.is(Dot) || t.is(DblColon)) && !self.nth_is(1, Newline) => {
+                Some(self.try_reduce_args())
+            }
             _ => None,
         }
     }
@@ -828,7 +828,7 @@ impl Parser {
         } else {
             todo!()
         }
-        let first = self.try_reduce_expr(false).map_err(|_| self.stack_dec())?;
+        let first = self.try_reduce_chunk(false).map_err(|_| self.stack_dec())?;
         let first = option_enum_unwrap!(first, Expr::Def).unwrap_or_else(|| todo!());
         let mut defs = vec![first];
         loop {
@@ -839,7 +839,7 @@ impl Parser {
                         self.skip();
                         break;
                     }
-                    let def = self.try_reduce_expr(false).map_err(|_| self.stack_dec())?;
+                    let def = self.try_reduce_chunk(false).map_err(|_| self.stack_dec())?;
                     let def = option_enum_unwrap!(def, Expr::Def).unwrap_or_else(|| todo!());
                     defs.push(def);
                 }
@@ -945,26 +945,7 @@ impl Parser {
                     ));
                 }
                 Some(t) if t.is(DblColon) => {
-                    let dbl_colon = self.lpop();
-                    match self.lpop() {
-                        line_break if line_break.is(Newline) => {
-                            let maybe_class = enum_unwrap!(stack.pop(), Some:(ExprOrOp::Expr:(_)));
-                            let defs = self
-                                .try_reduce_method_defs(maybe_class, dbl_colon)
-                                .map_err(|_| self.stack_dec())?;
-                            return Ok(Expr::MethodDefs(defs));
-                        }
-                        other => {
-                            self.restore(other);
-                            self.level -= 1;
-                            let err = self.skip_and_throw_syntax_err(caused_by!());
-                            self.errs.push(err);
-                            return Err(());
-                        }
-                    }
-                }
-                Some(t) if t.is(Dot) => {
-                    let dot = self.lpop();
+                    let vis = self.lpop();
                     match self.lpop() {
                         symbol if symbol.is(Symbol) => {
                             let obj = if let Some(ExprOrOp::Expr(expr)) = stack.pop() {
@@ -983,14 +964,54 @@ impl Parser {
                                 let call = Call::new(obj, Some(symbol), args);
                                 stack.push(ExprOrOp::Expr(Expr::Call(call)));
                             } else {
-                                let acc = Accessor::attr(obj, Local::new(symbol));
+                                let acc = Accessor::attr(obj, vis, Local::new(symbol));
                                 stack.push(ExprOrOp::Expr(Expr::Accessor(acc)));
                             }
                         }
                         line_break if line_break.is(Newline) => {
                             let maybe_class = enum_unwrap!(stack.pop(), Some:(ExprOrOp::Expr:(_)));
                             let defs = self
-                                .try_reduce_method_defs(maybe_class, dot)
+                                .try_reduce_method_defs(maybe_class, vis)
+                                .map_err(|_| self.stack_dec())?;
+                            return Ok(Expr::MethodDefs(defs));
+                        }
+                        other => {
+                            self.restore(other);
+                            self.level -= 1;
+                            let err = self.skip_and_throw_syntax_err(caused_by!());
+                            self.errs.push(err);
+                            return Err(());
+                        }
+                    }
+                }
+                Some(t) if t.is(Dot) => {
+                    let vis = self.lpop();
+                    match self.lpop() {
+                        symbol if symbol.is(Symbol) => {
+                            let obj = if let Some(ExprOrOp::Expr(expr)) = stack.pop() {
+                                expr
+                            } else {
+                                self.level -= 1;
+                                let err = self.skip_and_throw_syntax_err(caused_by!());
+                                self.errs.push(err);
+                                return Err(());
+                            };
+                            if let Some(args) = self
+                                .opt_reduce_args()
+                                .transpose()
+                                .map_err(|_| self.stack_dec())?
+                            {
+                                let call = Call::new(obj, Some(symbol), args);
+                                stack.push(ExprOrOp::Expr(Expr::Call(call)));
+                            } else {
+                                let acc = Accessor::attr(obj, vis, Local::new(symbol));
+                                stack.push(ExprOrOp::Expr(Expr::Accessor(acc)));
+                            }
+                        }
+                        line_break if line_break.is(Newline) => {
+                            let maybe_class = enum_unwrap!(stack.pop(), Some:(ExprOrOp::Expr:(_)));
+                            let defs = self
+                                .try_reduce_method_defs(maybe_class, vis)
                                 .map_err(|_| self.stack_dec())?;
                             return Ok(Expr::MethodDefs(defs));
                         }
@@ -1113,7 +1134,7 @@ impl Parser {
                     ));
                 }
                 Some(t) if t.is(Dot) => {
-                    self.lpop();
+                    let vis = self.lpop();
                     match self.lpop() {
                         symbol if symbol.is(Symbol) => {
                             let obj = if let Some(ExprOrOp::Expr(expr)) = stack.pop() {
@@ -1132,7 +1153,7 @@ impl Parser {
                                 let call = Call::new(obj, Some(symbol), args);
                                 stack.push(ExprOrOp::Expr(Expr::Call(call)));
                             } else {
-                                let acc = Accessor::attr(obj, Local::new(symbol));
+                                let acc = Accessor::attr(obj, vis, Local::new(symbol));
                                 stack.push(ExprOrOp::Expr(Expr::Accessor(acc)));
                             }
                         }
@@ -1208,14 +1229,29 @@ impl Parser {
             }
             Some(t) if t.is(AtSign) => {
                 let decos = self.opt_reduce_decorators()?;
-                let expr = self.try_reduce_expr(false)?;
-                let def = option_enum_unwrap!(expr, Expr::Def).unwrap_or_else(|| todo!());
-                let mut subr_sig =
-                    option_enum_unwrap!(def.sig, Signature::Subr).unwrap_or_else(|| todo!());
-                subr_sig.decorators = decos;
-                let expr = Expr::Def(Def::new(Signature::Subr(subr_sig), def.body));
+                let expr = self.try_reduce_chunk(false)?;
+                let mut def = option_enum_unwrap!(expr, Expr::Def).unwrap_or_else(|| todo!());
+                match def.sig {
+                    Signature::Subr(mut subr) => {
+                        subr.decorators = decos;
+                        let expr = Expr::Def(Def::new(Signature::Subr(subr), def.body));
                         Ok(expr)
                     }
+                    Signature::Var(var) => {
+                        let mut last = def.body.block.pop().unwrap();
+                        for deco in decos.into_iter() {
+                            last = Expr::Call(Call::new(
+                                deco.into_expr(),
+                                None,
+                                Args::new(vec![PosArg::new(last)], vec![], None),
+                            ));
+                        }
+                        def.body.block.push(last);
+                        let expr = Expr::Def(Def::new(Signature::Var(var), def.body));
+                        Ok(expr)
+                    }
+                }
+            }
             Some(t) if t.is(Symbol) || t.is(Dot) => {
                 let call_or_acc = self
                     .try_reduce_call_or_acc()
@@ -1370,7 +1406,7 @@ impl Parser {
                 todo!()
             }
         }
-        let first = self.try_reduce_expr(false).map_err(|_| self.stack_dec())?;
+        let first = self.try_reduce_chunk(false).map_err(|_| self.stack_dec())?;
         match first {
             Expr::Def(def) => {
                 let record = self
@@ -1390,7 +1426,7 @@ impl Parser {
         }
     }
 
-    fn try_reduce_record(&mut self, l_brace: Token, first: Def) -> ParseResult<Record> {
+    fn try_reduce_record(&mut self, l_brace: Token, first: Def) -> ParseResult<NormalRecord> {
         debug_call_info!(self);
         let mut attrs = vec![first];
         loop {
@@ -1403,12 +1439,12 @@ impl Parser {
                             let r_brace = self.lpop();
                             self.level -= 1;
                             let attrs = RecordAttrs::from(attrs);
-                            return Ok(Record::new(l_brace, r_brace, attrs));
+                            return Ok(NormalRecord::new(l_brace, r_brace, attrs));
                         } else {
                             todo!()
                         }
                     }
-                    let def = self.try_reduce_expr(false).map_err(|_| self.stack_dec())?;
+                    let def = self.try_reduce_chunk(false).map_err(|_| self.stack_dec())?;
                     let def = option_enum_unwrap!(def, Expr::Def).unwrap_or_else(|| todo!());
                     attrs.push(def);
                 }
@@ -1416,7 +1452,7 @@ impl Parser {
                     let r_brace = self.lpop();
                     self.level -= 1;
                     let attrs = RecordAttrs::from(attrs);
-                    return Ok(Record::new(l_brace, r_brace, attrs));
+                    return Ok(NormalRecord::new(l_brace, r_brace, attrs));
                 }
                 _ => todo!(),
             }
@@ -1558,7 +1594,10 @@ impl Parser {
         todo!()
     }
 
-    fn convert_record_to_record_pat(&mut self, _record: Record) -> ParseResult<VarRecordPattern> {
+    fn convert_record_to_record_pat(
+        &mut self,
+        _record: NormalRecord,
+    ) -> ParseResult<VarRecordPattern> {
         debug_call_info!(self);
         todo!()
     }
@@ -1721,6 +1760,32 @@ impl Parser {
                 self.level -= 1;
                 Ok(param)
             }
+            Expr::Call(mut call) => match *call.obj {
+                Expr::Accessor(Accessor::Local(local)) => match &local.inspect()[..] {
+                    "ref" => {
+                        assert_eq!(call.args.len(), 1);
+                        let var = call.args.remove_pos(0).expr;
+                        let var = option_enum_unwrap!(var, Expr::Accessor:(Accessor::Local:(_)))
+                            .unwrap_or_else(|| todo!());
+                        let pat = ParamPattern::Ref(VarName::new(var.symbol));
+                        let param = ParamSignature::new(pat, None, None);
+                        self.level -= 1;
+                        Ok(param)
+                    }
+                    "ref!" => {
+                        assert_eq!(call.args.len(), 1);
+                        let var = call.args.remove_pos(0).expr;
+                        let var = option_enum_unwrap!(var, Expr::Accessor:(Accessor::Local:(_)))
+                            .unwrap_or_else(|| todo!());
+                        let pat = ParamPattern::RefMut(VarName::new(var.symbol));
+                        let param = ParamSignature::new(pat, None, None);
+                        self.level -= 1;
+                        Ok(param)
+                    }
+                    other => todo!("{other}"),
+                },
+                other => todo!("{other}"),
+            },
             other => todo!("{other}"), // Error
         }
     }
@@ -1744,7 +1809,7 @@ impl Parser {
 
     fn convert_record_to_param_record_pat(
         &mut self,
-        _record: Record,
+        _record: NormalRecord,
     ) -> ParseResult<ParamRecordPattern> {
         debug_call_info!(self);
         todo!()
@@ -1855,7 +1920,10 @@ impl Parser {
         todo!()
     }
 
-    fn convert_record_to_param_pat(&mut self, _record: Record) -> ParseResult<ParamRecordPattern> {
+    fn convert_record_to_param_pat(
+        &mut self,
+        _record: NormalRecord,
+    ) -> ParseResult<ParamRecordPattern> {
         debug_call_info!(self);
         todo!()
     }

doc/EN/syntax/29_decorator.md

@@ -20,7 +20,21 @@ X = ...
 X = deco(X)
 ```
 
-Since Erg does not allow reassignment, the above code will not pass, and a decorator is required.
+Erg does not allow reassignment of variables, so the above code will not pass.
+For a simple variable, `X = deco(...)` is the same, but for instant blocks and subroutines, you can't do that, so you need decorators.
+
+```erg
+@deco
+f x = ...
+    y = ...
+    x + y
+
+# Can also prevent code from going horizontal.
+@LongNameDeco1
+@LongNameDeco2
+C = Class ...
+```
+
 Here are some frequently used built-in decorators.
 
 ## Inheritable

doc/JA/syntax/29_decorator.md

@@ -17,7 +17,21 @@ X = ...
 X = deco(X)
 ```
 
-Ergでは変数の再代入が出来ないので、上のようなコードは通らず、デコレータが必要なのです。
+Ergでは変数の再代入が出来ないので、上のようなコードは通りません。
+単なる変数の場合は`X = deco(...)`と同じなのですが、インスタントブロックやサブルーチンの場合はそうすることができないので、デコレータが必要になってきます。
+
+```erg
+@deco
+f x =
+    y = ...
+    x + y
+
+# コードが横長になるのを防ぐこともできる
+@LongNameDeco1
+@LongNameDeco2
+C = Class ...
+```
+
 以下に、頻出の組み込みデコレータを紹介します。
 
 ## Inheritable

examples/class.er

@@ -1,17 +1,17 @@
 @Inheritable
 Point2D = Class {x = Int; y = Int}
 Point2D.
-    new x, y = Self::__new__ {x; y}
+    new x, y = Self::__new__ {x = x; y = y}
     norm ref self = self::x**2 + self::y**2
 
-Point3D = Inherit Point2D, Additional: {z = Int}
+Point3D = Inherit Point2D, Additional := {z = Int}
 Point3D.
     @Override
-    new x, y, z = Self::__new__ {x; y; z}
+    new x, y, z = Self::__new__ {x = x; y = y; z = z}
     @Override
     norm ref self = self::x**2 + self::y**2 + self::z**2
 
-UnpackPoint2D = Class {x = Int; y = Int}, Impl: Unpack
+UnpackPoint2D = Class {x = Int; y = Int}, Impl := Unpack
 
 p = UnpackPoint2D::{x = 1; y = 2}
-UnpackPoint2D::{x; y} = p
+UnpackPoint2D::{x = x; y = x} = p

examples/enum.er

@@ -1,20 +1,20 @@
-LitExpr = Class {.i = Int}, Impl: Show
+LitExpr = Class {.i = Int}, Impl := Show
 LitExpr.
     new i = Self::__new__ {.i;}
     show &self = "{self.i}"
-AddExpr = Class {.lhs = Expr, .rhs = Expr}, Impl: Show
+AddExpr = Class {.lhs = Expr, .rhs = Expr}, Impl := Show
 AddExpr.
     new lhs, rhs = Self::__new__ {.lhs; .rhs}
     show &self = "{self.lhs} + {self.rhs}"
-SubExpr = Class {.lhs = Expr, .rhs = Expr}, Impl: Show
+SubExpr = Class {.lhs = Expr, .rhs = Expr}, Impl := Show
 SubExpr.
     new lhs, rhs = Self::__new__ {.lhs; .rhs}
     show &self = "{self.lhs} - {self.rhs}"
-PosExpr = Class {.expr = Expr}, Impl: Show
+PosExpr = Class {.expr = Expr}, Impl := Show
 PosExpr.
     new expr = Self::__new__ {.expr;}
     show &self = "+{self.expr}"
-NegExpr = Class {.expr = Expr}, Impl: Show
+NegExpr = Class {.expr = Expr}, Impl := Show
 NegExpr.
     new expr = Self::__new__ {.expr;}
     show &self = "-{self.expr}"

examples/list.er

@@ -1,18 +1,18 @@
-Nil T = Class Impl: Phantom(T) and Eq
+Nil T = Class Impl := Phantom(T) and Eq
 Cons T, N = Inherit {head = T; rest = List(T, N-1)}
 List: (Type, Nat) -> Type
 List T, 0 = Class Nil T
-List T, N = Class Cons(T, N), Impl: Eq
+List T, N = Class Cons(T, N), Impl := Eq
 List.
     nil T = List(T, 0).new Nil(T).new()
-    cons|T, N| rest: List(T, N-1), head: T = List(T, N).new Cons(T, N).{head; rest}
+    cons|T, N| rest: List(T, N-1), head: T = List(T, N).new Cons(T, N)::{head; rest}
 {nil, cons} = List
 
 a = cons(nil(Int), 1) |> cons 2 |> cons 3
 match a:
-    Cons(_, _).{head=h1; rest=Cons(_, _).{head=h2; rest}} ->
+    Cons(_, _)::{head=h1; rest=Cons(_, _)::{head=h2; rest}} ->
         assert h1 == 3
         assert h2 == 2
-        assert rest == Cons.{head = 1; rest = nil(Int)}
+        assert rest == Cons::{head = 1; rest = nil(Int)}
     _ ->
         pass